I really appreciate your insights here. Your arguments need to be understood within the context of negative polarization.

The politicization of Christianity on both the left and the right have led to increasingly homogenous churches. At the same time believers who have been deconstructing from a strict evangelical system towards something more progressive have often found themselves being excluded or even kicked out of the Evangelical movement.

Part of the problem is that "Evangelical Christianity" has been coded "White, Southern, Patriarchal." As you correctly point out that has made it very difficult for people to continue to identify with the movement.

It is similar to the problem of the "never Trump" Republicans. At what point in time do they drop the "Republican" label, as more do so the party becomes increasingly loyal to Trump.

The other problem is that the more people engage with science and or critical Biblical scholarship, the harder it is for many of them to maintain "Evangelical beliefs." When a world view crashes, it is not going to be put back together in the same way.