I don't know. I think presidents need to be more open about their faith and actually attend church, but Trump did not go to the church to pray or make a statement calling for unity (as we're all God's children). That was not the time for a political stunt, and I really don't like the Bible being used as one.
I can't vote for Biden because of abortion, but I'm starting to question whether I can vote for Trump again (that's not to say that I've come to the conclusion that I can't, because I still don't know). I suspect that similar thoughts are going through the minds of a lot of Christians right now, especially those who only mildly supported Trump to begin with.
The irony is Biden is easily the most religious president since Carter. Other than Carter, the most religious since Coolidge. That is a 100 year time span!
Also, Biden is on record saying he is personally pro-life and would try to talk someone out of an abortion, but ultimatly its the woman's choice. Obama or Hillary would never say that. I don't think any mainstream Democrat would say that unless you were a southern governor like JBE
Trump on the other hand is a known adulter and paid hush money to a porn star. And has run casinos and lusted for his daughter. Even if you are willing to ignore his personal sins for the overall movment, no one can deny he has done great damage to the evangilical movment by turning off suburban women in Atlanta or Charlotte or Phonix or Dallas aka the Bible Belt