Somebody please correct me if I'm wrong, but isn't the Bible pretty clear in its direction to support Israel?
"Isn't the Bible pretty clear in its direction to support Israel?"
Yes, it is very clear. Individual have only two choices. To either bless or curse Israel, nothing in between. Those who curse her, God promises to curse them. Those who Bless her, God promises to bless. The next question is where is your absolute final authority, in God's Holy Bible or in Man.
The longer one puts off putting his faith in God's Holy Word, the better chance they have or their heart's being hardened, their eyes growing dark and never being able to see the truth again. God is slow to anger, but time is running out.
I think a relative tangent to your question is the make up of the early church. Until Paul actively started evangalizing to the gentiles, the church was made up of almost all Jewish people. Peter of course was Jewish and he is the rock upon which the church is built.
An old, very involved story. Older than the present text of the bible, in fact, which was decided on only after centuries of that fight.