I can definitely see the argument on abortion. I'm sure many people can.
There are some things about Catholicism I don't agree with, absolutely. I think alter girls are a good thing for Catholics, but some say it should just be boys only. I think we need to allow priests to marry, but many would disagree.
But abortion is just one of those things that define Catholics as a whole...the right to life. If you don't agree with that, that's all fair and good, but I wouldn't consider them as part of the Catholic community. Same with Biden.