Personal religious creeds that a politician purports to hold should have nothing to do, IMO, with whether they are fit to be President. What matters is whether they are prudent, reasonable, and responsible, and how dedicated they are to the core values of the Constitution, which includes the separation of the state from any particular religious creed. Based on what's happening this year, it appears we are pretty close to overtly having a religious test for office in this country (not that there wasn't a widely held 'covert' religious test before). I'm frankly surprised that doesn't concern more people than it does.
When was the last time that candidate's religious affiliations and backgrounds were as overtly interjected into national politics as they are in this cycle? Never in my recollection. :cover:
So I would vote for a Mormon, a Muslim or an atheist, depending on whether they were the best candidate in those matters that really count. Beyond that, their preferred religious creed is irrelevant.