Their theology alone would make them off-limits to the vast majority of trinitarian Christians.

I don't have any way of proving this, but I get the impression that Mormonism pulls most of its converts from people who were somewhat estranged from mainstream churches to begin with. It's hard to imagine a devout and content Baptist, for example, thinking he should explore further the idea that Jesus was the product of divine sex on another planet.

So, if America undergoes a series of cataclysmic events that utterly destroy traditional Christianity, like, say, Red Dawn happens and the commies win, maybe when it's all over and things are getting back to normal, the Mormons can be the only faith left that's capable of drawing in large numbers.
 
Hmm, Mormons are pretty prominent in Utah and Idaho in the US. Getting to a majority there isn't ASB. So here's your POD.

The Mormons push preparedness even more hardcore than in OTL. They also concentrate more in Utah/Idaho than OTL. Less of them go to Mexico.

Some major mass casualty event (e.g. WWIII in the 1970s--very bad--or 1980s---worse, or a Carrington event in the 1990s or 2000s) occurs killing most of the US population. The Mormons manage to save their states and most of their population. Being top dogs, lots will convert to Mormonism.

That's probably the least ASB way to get majority Mormon in the US.
 
Cold War goes hot in 1980's and Utah is only place where is some level of viability and it delcares itself as United States of America.
 
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