Well, in Utah I imagine that’s the case.

As a politician, it is not desirable to be connected to the Mormon church (they want to put their finger on the scales, you have to tithe a lot, etc).

You want the credentials but not the cost, or you end up in a very hard balancing act with a lot of internal politics.

There are Mormon politicians in Utah - but not as many as you would think. It looks like currently three Utah districts have Mormon reps.

Locally you may see a lot more Mormons as the political balancing act is overall easier.

In Utah that situation would have majority popular support.

I really can't see majors differences between socially conservative evangelical Christians and those other groups, if we're talking the harm they can cause politically.

There's no difference, it's just that evangelical cults are much bigger and more accepted in the US.

There's basically a single meaningful Evangelical cult in the US and it is mostly genealogical (ergo tiny). They also have a big population center in Mexico oddly enough (or did a few years ago, but there was a cartel massacre of them so they may have left).

This is the "everyone who disagrees with me is a Nazi" problem.

Evangelicals are distinct from cults. You may dislike both, in the same way you can dislike peanut butter and chocolate, but that doesn't mean they are the same or identical.

(There are also Evangelical cults but that is a small percentage of Evangelicals)