Across eleven days I had the pleasure of encountering some very intelligent discussion last year. However only three of my five arguments were debated, and on re-reading the thread I have to say that I don't think my arguments were defeated (or even particularly damaged) in any case. Maybe that's just arrogance talking

Some italicized comments in [square brackets] will be comments/insights gleaned from the original debate or other more recent ideas, and I've added two new arguments to the original five. A few small changes have been made to my original wording also.
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I'm bored and a little drunk, so I figured I'd give this a shot. I don't believe in a god, but I always find it quite stimulating to think of the pro and con arguments. Limited by belief in biblical infallibility, conservative Christians are easy prey for atheists. But weighing both sides of a position, I've been known to change my own mind on occasion, so if nothing else that might make it an interesting endeavour to see how convincingly I might argue for the existence of a god.
'God' is here defined as an infinite personal Creator of everything. I won't argue (and don't believe) that concepts like 'good' and 'evil' have any true meaning with or without such a being's existence; with a God, he calls the shots, and without they're meaningless. I won't argue for biblical infallibility or even that the monotheistic faiths are the only ones with experience of this god; though some arguments will come from Judaism/Christianity if I get 'round to it.
I'll try to be relatively brief in my initial post, hoping to start debate rather than win it, but since the responses will probably be considerable it may take time to cover all points. For the sake of convenience, I'll broadly number my arguments and hopefully those responding will follow suit.
1 - Berkeley's immaterialism
This is based essentially on the problem of epistemology (the theory of 'knowing'). All science and a great deal of other human knowledge is based, ultimately, on observation; yet 'observation' for any individual amounts ultimately to nothing more than perceptions in the mind. If you've seen The Matrix, it's obvious that anyone plugged in has no way of knowing that what they see, feel, hear etc. isn't real. The difference in Berkeley's argument is that there's no real physical world with machines running the Matrix.
Berkeley agreed with the emerging sciences of his day that what we observe is real, and also with the philosophers that what we observe occurs in the mind. Reality, therefore, is a thing of the mind, not of some ultimately unprovable material world. Thus either I am the only mind in existence, and everything and everyone I've perceived is a figment of my imagination, or there are indeed other minds whose generally shared perceptions must necessarily be part of a greater Mind. The problem of epistemology is a significant one regarding the reliability of the sciences - observations occur only in the mind - but a wholly immaterial universe can be both largely consistent and largely comprehensible. There's genuine evidence for the phenomenon of perception (and less certainly, for shared perception between minds), but there's no genuine evidence for a material world - so why postulate one?
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2 - Consciousness
Quite briefly, it's obvious that I possess a quality which I call consciousness, and it's equally obvious that a rock does not. There is no evidence for any theory suggesting that physical molecules grouping together in a complex enough fashion could give rise to this non-physical phenomenon known as consciousness. Related to and compatible with the above, but ultimately distinct, each person has genuine evidence for consciousness, but no genuine evidence regarding a physical basis for it. Pure immaterialism may or may not be the best explanation for this phenomenon, though an alternative is the existence of some non-material aspect of the universe somehow linked to the material.
[In discussion with Bernee51 and AkiThePirate, I suggested a working definition for consciousness as:
"Awareness - the difference between someone in a coma and someone awake."
"I'm just theorising here of course, but probably the most basic indicators of awareness are reaction to pain and movement/exploration to acquire more sensory data. While it's true that different species have different means of acquiring sensory data, and different levels in their capacity to evaluate, remember and extrapolate from it, those would seem more like faculties in addition to 'consciousness,' not differing types or levels of consciousness itself."
I couldn't think of anything outside the kingdom animalia which fit this working definition. We infer consciousness in other humans by constant observation and very strong analogy, and in dogs or the like by similar but weaker means; however without a degree in marine biology, I was unable to answer whether a jellyfish possesses consciousness. I argued that lack of complete certainty (or even a final, conclusive and unchangeable definition) about consciousness in all cases is not a weakness in the argument, any more than it is in the sciences; we work from observation, refining our hypotheses to reach the best conclusion.
Neither Bernee nor Aki was able to provide an example of component parts producing a whole or side-effect which was qualitatively different from those parts. Towards the end of the discussion Aki suggested that consciousness isn't non-physical, because everything that exists that isn't space or time is physical (matter or energy). I don't believe that he proved that contention, the particular counter-example we ended with being the fractals which he'd mentioned earlier in the discussion.]
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3 - First cause and contigency
Everyone's probably familiar with the 'first cause' cosmological argument. Logically, the universe must be attributed either to an infinite regress of prior universes or some precedences (which seems unlikely) or it is self-caused or uncaused (equally unlikely). The same applies to the concept of God, of course. But there's a distinction which non-theists often don't seem to grasp; since long before the birth of Christ, the monotheistic concept of God has consistently been that of a timeless, uncaused Creator. The concept of material reality by contrast has consistently been that of a contingent existent, each aspect relying on previous aspects for its existence and nature. Whether it's a combination of the cosmological and ontological arguments, or Aquinas' first three arguments (I'm not enough of a philosopher to make the point clearly), the outcome is the same. An ultimate self-causation, non-causality or infinite regress in a contingent universe seems absurd compared to the possibility that a non-contingent entity caused all else.
[Responses (from memory) mostly pointed out that this falls far short of proving the 'personal, infinite' God I set out to. However I believe that at the least, the argument might lay a good foundation for the theists' additional arguments. In fact, CalvinsBulldog has made some interesting points about a personal nature for the first cause in the Ten Best Apologetic Arguments thread.]
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4 - Evolution
Paleo-biology is an even weaker point for me than philosophy, but it's my understanding that there's virtually no evidence in the fossil record for transitional forms between major classes, let alone phyla. This contrasts severely with the expected findings of the phyletic gradualism theory of evolution initially envisaged by Darwin, giving rise eventually to the punctuated equilibrium theory of evolution - suggesting, if memory serves, that significant major phases of evolution occured in restricted environments under greater selective pressure, before the resultant changes spread more widely and became visible in the fossil record. I don't know whether there's other theories around, nor how many scientists still adhere to the idea of phyletic gradualism.
However in the absense of any real evidence, the theory of punctuated equilibrium seems a tacit admission that the mere factors of genetic variation, random mutation and natural selection are not borne out by the available data as the sole cause of the earth's biodiversity. A confined ecosystem and greater selective pressure cannot, to my understanding, exessively increase the range nor rate of possible available genetic variants; so what we're left with is a theory which seems somewhat to rely on an inexplicable jump in mutations in those supposed confined spaces with high selective pressure.
If any biologists can correct me on any mistakes made above, it would be welcome. However from a layman's point of view, it seems that phyletic gradualism is grossly unevidenced in the fossil record, while punctuated equilibrium seems an intelligent but not particularly persuasive effort to explain the discrepancies. Is there any reason to go for an 'inexplicably increased rate in mutations and evolution'-of-the-gaps theory, rather than god-of-the-gaps?
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5 - Prophecy of Daniel
The biblical book of Daniel was written partly in Hebrew (ch 1 and 8-12) and partly in Aramaic (2-7). I contend that there's no compelling reason to believe that the Hebrew portion is not genuine 6th century BCE material. Based mostly on the 11th chapter, secular scholars argue that such knowledge of the long interactions between the 'king of the north' (Seleucid Greeks) and 'king of the south' (Ptolemaic Greeks) could only be the product of a later author and, based on 11:36ff suppose that it was written shortly before Antiochus IV Epiphanes failed to do those things.
Besides the presupposition that the chapter must be naturalistic in origin, there are two major flaws with this view. Firstly the idea that a king (Antiochus IV) who'd spent much effort attempting to Hellenize the Jews would suddenly "show no regard for the gods of his ancestors" (11:37) and instead exalt a foreign god (38-39). Such an idea would be virtually inconceivable to a Jewish author living under Antiochus' reign. Secondly, the fact that the 'abomination of desolation' from v. 31 was prophecied at a specific time - Daniel 9:25-27 says it will occur roughly 70 sevens after the command to restore and rebuild Jerusalem. Depending on the starting date, to a later Jew that could have meant anywhere from c53 BCE to c42 CE - either way, it's clear that Daniel 11:31 does not refer to anything which happened under the reign of Antiochus IV Ephiphanes (c167 BCE).
Above all, Daniel 8 refers to 'king' Belshazzar, a figure unknown to historians until a few cuneiform inscriptions were found in the last century. He was actually son to the last king of Babylon, Nabonidus, but ruled in his stead while Nabonidus resided elsewhere (memory fails me at this point, but pending confirmation I believe that one inscription mentions the name Belshazzar, while a different one clarifies his co-regency). Belshazzar is a name unknown in any Greek history - so while it would have been natural for a 6th century Jew to refer to 'king' Belshazzar, it's a mystery how a 2nd century BCE Jew would even know the name, let alone that he was crown prince and co-regent to Babylon's last king.
The balance of evidence suggests that Hebrew Daniel was written in the 6th century BCE, containing remarkable prophecy regarding the Greeks - and, even more intriguingly, arguably that it prophecies a messiah who would be 'cut off' sometime in the 30s CE (9:26).
[I should note that I use the term 'prophet' and 'prophecy' for Daniel. But by biblical standards he wasn't a prophet; he recorded visions of the future, but he didn't pass on the 'word of the Lord' as the other prophets did (cf Deuteronomy 18:14ff). The arguments about Daniel are a little more specialist and harder to summarize than for consciousness, but I invite interested folk to browse the discussion I had with Goat on the topic.]
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6 - Jeremiah's Gematria
The concept and implied validity of this argument was actually shown to me by another atheist (Goat). I'm assuming my research last November was accurate, though that may be worth double-checking. However.
In Daniel 1:1 'Nebuchadnezzar' is written in Hebrew with a particular variation in spelling, one of several different spellings found throughout the standard Masoretic text of the Tanakh. The earliest biblical use of this particular spelling is found in the work of the prophet Jeremiah; in 27:6, from around 593 BCE, while Ezekiel 26 uses the same spelling around 7 years later. Jeremiah was a source of inspiration for Daniel, with his 70 years of Babylonian domination being the spring-board from which Daniel predicted his 70 'sevens' (Daniel 9). Whereas a major theme of Daniel's visions was the ravaging and persecution of the Jews by the Seleucid king Antiochus IV Epiphanes, a major theme in Jeremiah's prophecy is the ravaging and persecution of the Jews by the Babylonian king Nebuchadnezzar. In chapter 27, Jeremiah speaks not just to Judah but to all the surrounding nations, declaring God's supreme power and warning them to submit to the rule of his servant Nebuchadnezzar.
That said, one can't help but consider it extremely intriguing that the precise manner in which Jeremiah spelled 'Nebuchadnezzar' while telling all nations of God's supreme power just happens to be a perfect match in Hebrew gematria for Antiochus Epiphanes! Goat, citing Wikipedia, initially advanced this as an argument that the author of Daniel must have been writing in the 2nd century. But having advanced it as a meaningful point, the fact that undisputed 6th century works use the same spelling means that on the contrary, not only does it suggest Daniel as a 6th century work but it's a remarkable indication of the hidden foreknowledge which even God's prophets may not have recognised themselves!
In Hebrew, as in many other ancient languages, names and words often have numerical value (see Gematria). Nebuchadnezzar's name in cuneiform is Nabû-kudurri-uá¹£ur which should be transliterated into Hebrew as × ×‘×•×›×“× ×�צר or Nebuwkadne'tstsar (as it is in Jer. 46:2, 39:11). It is unlikely to be a coincidence that when the numbers represented by "Nebuwkadne'tstsar" are added up, they come exactly the same figure (423) as the numbers of the name "Antiochus Epiphanes".
~ Wikipedia
Wikipedia and Goat may not be authoritative sources on the subject of 'unlikely to be coincidence' or the like. Nevertheless, on face value it seems that any but the most intractable sceptic must admit that it's a rather remarkable phenomenon. See here for my detailed and impeccably expert analysis of the Hebrew language in the relevant passages

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7 - Origin of life
Since it's related to argument #4, I figured I'd throw this in here too. But it deserves its own point because if my rather uneducated guess is correct that evolutionary theory still has major gaps to fill before being truly plausible as a naturalistic explanation, that is even more obviously and certainly the case regarding the origin of life itself.
- Since life exists, if it wasn't created then it must have arisen spontaneously. However that has never been observed by humans, all experimental efforts to recreate the right conditions in which it could occur have so far failed and there's not even any accepted model as to how it occurred (http://en.wikipedia.org/wiki/Abiogenesis). Since it is essentially unprovable, as you've noted it's quite rare to see atheists making that claim in a debate context despite being a logical consequence of atheism.
*sigh* I was trying to wax poetical for a dramatic conclusion there, but I think I failed. Anyways, that's about all I've got for now - enjoy
