American Jews are not in lockstep with Israel, at all. Traditionally Evangelical Christians are the most pro-Israel religious group in the US. And that's a religious group that is fairly marginalized among the Democratic party.
Democrats also generally really hate Bibi.
Some religious groups in America tend to not be super, well, religious. Many Americans consider themselves Jewish or Catholic despite not practising their religion in any meaningful way (as a random example, this American considers himself Catholic despite being an atheist).