The "Moral Majority" imploded under their own religious hypocrisy, so I'm not surprised an equivalent group has failed to significantly inherit their mantle. Can't see the fringe dominionists/Christian Nationalists that got some attention resurrecting a coherent bloc either, since they are inherently divisive.
The political division between Catholics and Protestants is being overstated though in calling them Christian political minorities in comparison to "nones".
Especially amongst Republicans. Don't 9/10 still claim to believe in God and roughly the same amount consider the bible either the literal truth or the inspired word of God? They just don't attend Church (the question of whether any of them still have any actual faith and manifest it in their lives is of course entirely open).
Not sure Trump was really that big a change in direction policy wise either, and not just because his personal conspicuous consumption and self promotion as branding fits in well with prosperity doctrine and "justified by wealth". He also proved perfectly happy to ignore the populism he used as self promotion to support more typical Republican positions. Including when pandering to religious positions. You saw that as he shifted stance on abortion from "hating it, but being in favour of choice" to talking about a punitive approach (although he flip flopped on his comment on punishing women when called on it).
Tax cuts for the wealthy are of course still completely on brand for him.