I think you have it exactly backwards.
My guess is evangelicals are among Trump’s strongest supporters.
I’m not so sure. The Southern Baptists are in turmoil. Many of their pastors are caving, even people who were firmly conservative an election cycle ago.
The rank-and-file, not so much. But the seminaries, like in more liberal denominations, have gone hard left in the SBC.
Unfortunately, FBC Dallas is an outlier.