do americans support Israel for bible ?

What does "support Israel for the Bible" even mean? Americans generally support Israel. 

If the Romans hasn't killed Jesus Christianity wouldn't exist. So to bemoan this idea that he should have been allowed to live pretty much undercuts any reverence you might have for that faith. 

There is a segment of Christianity which reads certain passages in the Bible as requiring the Jews to return to Israel and the Temple to be rebuilt before the end times can occur and the Kingdom of God can be established on earth.

While most theologians disagree with this interpretation of scripture, this segment of the population (maybe 10% of the population) will support Israel regardless of what they do.

Most Americans support Israel for historical reasons -- the belief that the area that were the kingdoms of Israel and Judah are the homeland of the Jewish people (putting aside that Judaism is a religion and Hebrew is the ethnicity and the two are not necessarily the same) and that the treatment that Christians gave the Jews in Europe for 1500 years required that the Jews be given their own country.  

It would take a much longer post to comment on the religious leadership of Judaism in first century Judah.  But most Christians and Americans today recognize that the political/religious leadership of the time were not the mass of Jews or Hebrews living in the area at the time.