I don't really follow politics closely enough to comment knowledgeably. I can only hope that evangelical christians will go down along with the whole Trump administration & Trumpism-at-large. However, since we've slowly but surely been hoodwinked into believing that "the U.S. was founded on solid christian principles" over the last 150 years, it doesn't strike me personally that religion & politics will soon be separated.
I would have to say that sadly, that is likely mostly wishful thinking. These bastards get their money from the churches, who have no taxes to pay, thus giving them a huge advantage in a political system thats lifeblood is cash. The only way to defeat these bastards is to destroy the foundation that they thrive upon, their foundation of lies, and wake people up to what they are doing. Destroy their base, their cash source, and expose them for the charlatans they are. This is a battle, and until we see that, and act, they will keep on doing what they have been doing.
Churches receive federal funding:
Recruiting pastors to run for political office
I remain convinced that Christian fundamentalism is an unsustainable movement whose days are numbered. I just don't know what the number is, and I don't know what sort of dystopian bullshit we'll have to endure before it breathes its last. Naziism wasn't sustainable either, but look what humanity suffered because of it in the meantime.
There are still a dozen scenarios that look plausible to me for how Trumpism will play out, and 8 or 9 of them are not remotely good. And that's just Trumpism. It's not like that's going to go away with Trump. Trump was a symptom, not a cause. The next asshat who tries to take over the joint might have more talent and discipline and courage of his convictions than Trump -- he might be less of a buffoon and less queasy at the sight of blood. Or ... he might just revert to a less overtly sociopathic agenda (Pence, anyone?).
I would really like to think that my country is moving towards a more secular philosophy, generally speaking. But, my own experience with the folks who really hold the reins that guide our land are pretty devout, and rigid in their beliefs. And, they tend to nuture, groom, and promote folks just like them. I speak of the professional bureaucrats and military. The ones I worked with were almost fanatic in their Christian beliefs and dogma. I don't see that as rapidly going away.