I'll keep this to my own history...
The church I grew up in during the 70s (Lutheran) hired a young, idealistic pastor who wanted to come to our church at least in part because it was in DC. He went to protests and was arrested at least once. The congregation didn't really join his crusade, but neither did they seem to object.
The church I attended where I met my wife, got married and started my family (United Methodist) didn't bring politics into the sermons, but it was clear that they pretty much leaned right.
The church I go to now (non-denominational but started by former members of my previous church) also mostly avoids politics and instead turns everything into turning toward prayer and scripture for answers as opposed to falling on any one side of the political aisle.
The church mentioned in the article is a mega-church, and up until recently had a favorable image as far as I know; their former head pastor's sermons could be heard on local Christian radio and was consistent with typical orthodox teaching, and their size enabled them to host concerts/events for popular/mainstream Christian artists and such. I'm not sure if it's just a coincidence that the 'fracturing' at this church started just a couple years after its long-time pastor stepped down or not, but I think most churches always have these kind of undercurrents running through them, where cliques form, turn into echo chambers and become a full-blown 'movement', which in the setting of mega-church just makes divisions harder to reconcile. I think their situation was probably exacerbated by Trump's ability to convince these disgruntled congregants that he was on their side, which I guess to a degree supports the premise of the article. However, I don't believe this phenomenon is unique to Trump; the church I was going to during Dubya's presidency was teeming with his devotees, mainly for his stance on same-sex marriage. What seems to be common is supporters of whoever the current President is won't hesitate to talk about how it's God's Will that he (and eventually, she) is President but will fall silent about one that they don't like, and that has probably existed as a thing since there has been organized religion of any kind.
To me, Christianity should be apolitical; it's about trying to be an example to others of the love and grace that God showed to us in the form of Jesus' life, death and resurrection. Political/social issues will come and go, and the challenge is how to deal with them in a manner pleasing to God, which it can be argued doesn't look the same in every situation.
Bottom line,
@The Commish made the best point when he said the 'Evangelical Church' is not a monolith, and trying to extrapolate an entire seismic shift like this based on one example is nearly pointless. At the same time, it's fair to concede that other churches may have similar issues to greater and lesser extents, but the results won't necessarily be the same.