The Dem Jewish vote generally goes to more-secular candidate. In other words, between a serious Christian and secular "ethnically Christian", the Jewish vote goes mostly to the latter.
I rephrase the question: should we consider it bigoted for a Jewish voter to reject a candidate PURELY because the candidate is a devout Christian?
No more bigoted than an Evangelical voter rejecting a candidate PURELY for their Mormonism.
And secular Jewish voters tend to vote for LIBERALS. Carter was more overtly religious than Nixon. Who got more votes from secular Jewish voters?