Are the Hebrew scriptures (OT) compatible with the Greek scriptures (NT)?

[Scholar]

Another way to ask this question is, are practicing Jews justified in rejecting the Greek scriptures as being incompatible with the Hebrew scriptures? Or are the believers in the divine origin of the Greek scriptures (Christians), justified in saying that the two testaments are a consistent, coherent message from God?

Items to consider: The Greek scriptures are interpreted as describing God as a Trinity, whereas the Hebrew scriptures make it very clear that God is One without qualification.
God's purpose in the Hebrew scriptures is mainly to have His chosen people worship Him, whereas in the Greek scriptures God's purpose is to save every individual in the world, especially for the afterlife.
No consideration of rewards or punishments in the afterlife in the Hebrew scriptures. The afterlife and the dead are inconsequential in the Hebrew scriptures.
In the Hebrew scriptures, the Jews are to obey the Laws forever. In the Greek scriptures salvation is only obtained by faith in Jesus Christ for everyone. The Law has always been impossible to fulfill and was a lesson in futility.
God can forgive anyone in the Hebrew scriptures. God can only forgive those that accept Christ as their Savior in the Greek scriptures.
In the Hebrew scriptures, the Messiah is to appear once and be triumphant. In the Greek scriptures the Messiah must appear twice, and as it turns out, these appearances are separated by thousands of years.
What do the Hebrew scriptures say about the practice of human sacrifice?
Does the description of the "suffering servant" of Isaiah 53 refer to the Messiah?

[Avoice]

[Replying to Eloi in post #2]

No he wasn’t. Where was Jesus predicted to Moses?

And where is the God of Israel quoted to have said anything about Jesus?

[Avoice]

[Replying to Scholar in post #1]

I really don’t feel like typing so I’ll get this short.

They are not compatible

Isaiah 53 is speaking of Israel. A note on that: It doesn’t say fir the transgressions of my people HE was stricken. It says THEY. The church changed it . They had to.

The Christian testament may say that no one can keep the law . But they screwed up. Notice what it said about Johns parents. It says they walked according to Gods ordinances snd were blameless.