LOL America is full of jesusfreaks therefore Trump wins.
I don't think that. Far from it, actually. But I do think a few things.
1.) Biden is not popular enough - he was the wrong candidate. I don't think anyone in the Democratic race was a good enough candidate.
2.) There are enough white Christians in battleground states that will either not vote, or vote 3rd party, and combined with
3.) The Republican's voter suppression efforts in other demographics, this will lead to enough purple states remaining red for Trump to win the Electoral College.
That's what matters - Can the Democrats flip enough purple states, or usually red states that look flippable (like potentially Arizona), to make the Electoral College work for them.