Why is the God on the old testament so different from the one in the new testament?

To keep the human blood line clear. There was some kind of interbreeding going on between God's favored stock and something else (which is not clear) what is clear is that Noah and His family were the only ones left that were perfect in their generations.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.