I should add that adults, wishing to become Roman Catholic, have to go through months of instruction, before they can be baptized or confirmed.

My father-in-law was Italian, but raised as a Presbyterian. As long as I had known him, he didn't go to church. When he was dying of cancer, he asked if I'd take him to mass at the Catholic Church, to which I belonged. He wanted to receive Communion, but bad Catholic that I am, I didn't stop him. He was worried that the priest would say something, but I told him that while the priest was a pretty bright guy, he can't tell a Protestant from a catholic just by looking at them.

After he died, a funeral mass was held for him at my brother-in-law's catholic church in his hometown. The priest there had known my father-in-law casually through my brother-in-law and also by the fact that my father-in-law operated a popular restaurant in town. father Rick scheduled the mass, thinking the deceased was just a non practicing Catholic. When he asked my brother-in-law after the service where my father-in-law last attended church, he was surprised that it was the local Presbyterian church. My BIL asked if this was a problem, the priest said, "Not really, but now I have to explain it to them and the bishop."