14 I write not these things to confound you; but I admonish you as my dearest children.
15 For if you have ten thousand instructors in Christ, yet not many fathers. For in Christ Jesus, by the gospel, I have begotten you.
1Corinthians 4:14-15
Apparently St. Paul was Catholic.
Maybe you could ask them if they think St. Paul needs to go to Confession.

I've also pointed out that everyone, including protestants, address their earthly father using some equivalent term; in the US it's usually "dad".
dad (n.)
"a father, papa," recorded from c. 1500, but probably much older, from child's speech, nearly universal and probably prehistoric (compare Welsh tad, Irish daid, Lithuanian tėtė, Sanskrit tatah, Czech tata, Latin tata "father," Greek tata, used by youths to their elders).