American evangelicalism has started to change, and is a lot different than how it was in the early 1980s. The pro-life movement did a good job of wedding about 80% of evangelicals to the GOP, but it is no longer probably the biggest factor keeping them loyal to Republicans. The 20% of evangelicals that typically don’t vote Republican are mostly black evangelicals, it is fairly rare for a white evangelical to vote Democrat; 2020 exits show about 27% of white Protestants voted for Biden, but don’t break it down as specific as evangelical or not by race, they do break it down by evangelical or not, and around 76% of evangelicals supported Trump. Essentially you can assume most white evangelicals voted for Trump.
There has been a decline in white evangelicalism, from around 23% of the population in 2006 to around 14% in 2020–and most of those people have not left religion. PRRI suggests that at least a decent chunk moved into mainline Protestantism. Various articles who have looked into it have found a somewhat strong trend of younger white evangelicals choosing to drop the label “evangelical”, somewhat specifically because they just were put off by how so many evangelical churches were essentially transforming Sunday into Republican political rallies. Now, for Democrats all of these people didn’t just switch to team blue, many and probably most of these religious whites are still going to vote for Republicans, but they just don’t want to attend worship services at the religious equivalent of a Trump rally. Those voters are probably more persuadable to Democratic ideas than the cultists they left behind, though.
The flipside of course is evangelicals who just aren’t “feeling” the “let’s become an appendage of the Trump Organization with a bit of the Klan thrown in” dropping the “evangelical” descriptor and migrating to Lutheran, United Methodist, American Baptist etc churches means the ones left behind are basically becoming entrenched and hyper-committed Christian nationalists.