“Are Evangelicals more accepting of a Jewish candidate as opposed to a Mormon?”
Evangelicals and Haredi differ on pretty much one theological issue: who is/was that carpenter from Bethlehem?
Most evangelicals would covert to Orthodox Judaism (or at least some sort of Noahacide relgion, if they changed their belief in that regard).
That said, Romney’s problem ia nor that he’s a mormon. His problem is he is a lifetime liberal who is now clearly lying about being a conservative.