Few is any. Joe will get at least half of the Catholic vote maybe more. “Catholic” Dems are pretty unreachable I know a few and it’s hopeless.
2016 Trump carried Catholic vote 52-45 over Hillary. He got 60-37 of white non Hispanic Catholics
https://www.pewresearch.org/fact-tank/2016/11/09/how-the-faithful-voted-a-preliminary-2016-analysis/