How would Utah (and SE Idaho) vote without Mormonism?

[OBD]

Well first off, there's a good chance Provo straight-up doesn't exist - the city's 85% Mormon and LDS is a huge part of why it's so settled today. I mean, there's probably still a town there, but it would have like 10-15% of Provo's population. There'd be a similar effect in SLC - SLC would likely be significantly smaller.

Overall, I'd expect the urban parts of Utah to vote more Democratic - Salt Lake City would be pretty solidly blue, and places like Logan/Pocatello/St. George won't be as monolitically Republican. Utah would probably be a 5-EV Tossup-Lean R state that's trending left (thanks to SLC burbs), while SE Idaho would be Generic Western Conservative territory with blue islands in Pocatello and (potentially) Idaho Falls. Tbh, Utah would have a similar dynamic to states like Oregon, where a (Democratic) city vies for political influence with (Republican) rural areas.