In my experience, many people say they believe in God because God gives their lives meaning. This reason to believe involves two important claims that should be separated:
- If God did not exist, life would not have sufficient "meaning".
- This previous claim, if true, is itself reason to believe that God does exist.
I think both of these claims are false. That is:
- I think that life has plenty of "meaning" even though I think there is no God. For example: I still think the world is beautiful, that there is reason to be good to other people, that there is often reason for awe and humility in the face of nature, that life is a precious thing, and so on. In fact, I often think a life with a God would have less meaning, just as I think an adult life spent living with your parents has less "meaning" than when you strike out on your own.
- Even if it were true that life would not have sufficient meaning without God, I don't think that would itself be reason to believe that there is a God. Compare this: even if it were true that without $1 million I can never be happy, I still don't think that alone is reason to think I have $1 million. That is, even if I really do need $1m to be happy (something I doubt), maybe the truth is I just don't have enough money to be happy. To believe I have that money just because I need it is to commit the wishful thinking fallacy.
- It can bring people together in a community, for contemplation, celebration, and grieving.
- It can get people thinking about ethical issues.
- It can get people thinking about spiritual issues.
- It can encourage calm reflection and meditation.
Meanwhile I think belief in God encourages some very bad things:
- For many, it encourages faith--which is just belief without reason, and which many seem to agree is irresponsible (as in this thread).
- In particular, such faith appeals lead to impasses and intolerance when encountering cultures that disagree. As we have seen throughout history, this is a common cause for war and terrorism and the like.
- Belief in a non-material intelligence promotes a kind of magical, non-scientific thinking.
- It historically has promoted, and continues to promote, confused ethical values based solely on particular leaders' readings of "what the Sacred Text says".
- It has hindered, and continues to hinder, the progress of science (by resisting the Copernican revolution, or evolutionary theory...).
Well, that's plenty to start discussion. What do you think? Is life meaningless without God? Even if so, would this alone be reason to believe that God does exist?

spetey