Mormons are by and large mainstream Americans.
I would suggest that the Republicans do not need your narrow-minded-bigoted vote. Go vote for a good mainstream "Christian" like Hillary or Bill Clinton or Jimmy Carter or Al Gore or John Kerry.
To be quite honest back in my younger days I actually voted for Jimmy Carter because he was a "Born Again" Christian and pretty damn vocal about it. I thought how great it would be to have a dedicated Christian as president. It turned out that he was absolutely hands down the worst president that the United States has ever had. Clinton may come in a far distant second, but "Born Again" Jimmy was absolutely the worst president of all time.
You know the Quakers aren't exactly mainstream Christians, yet Richard Nixon was a Quaker and (despite the watergate thing) a pretty decent president. Ronald Reagan was divorced and then later married an astrology queen before he was elected president. I suppose these guys would all be out of the picture in your perfect world, eh?
"I simply will not vote for a Mormon, end of story - and I don't care who might get elected in the end."
Doesn't that make you a bigot?
How about Jews? Do you vote for them?