It's more visceral than being tired of being left out. Christians are mapping the trajectory of the cosmopolitan left culture, see things like the Brendan Eich incident, and are genuinely afraid that there's a leftist fascism developing. Maybe they're jumping to conclusions, but that's what they think.

Also, abortion is a really big deal. To some degree, the evangelical/conservative Christian vote was split this time around because Trump had a loud but not very reputable position against abortion. It's remarkable that Trump won despite that shortcoming.