Can't think of any big time rock and rollers in the USA who are devout Catholics (Bono, who is Irish, is the only one I can think of worldwide). I do know that Alice Cooper is a born again Christian (Assemblies of God?), who had been an atheist after rebelling against his Mormon parents.
I think Dion was a revert and found his way home.
Are you sure that Bono fellow is Catholic? I thought he was some sort of "born again"
Bono grew up in a split-household (Dad is Catholic, mom is Protestant). He is not a practicing Catholic of any sort, and does not subscribe to any organized religion.
There are few, if any, actual Vatican-loyal practicing Catholics anywhere in show business. Someone said Patricia Heaton is a practicing Catholic, but that's not true, either. She's a fallen Catholic whose sister is a Dominican nun, but she attends a Presbyterian church.
Caviezel might be the closest thing to a Vatican-loyal Catholic in Hollywood. It's EXTREMELY difficult to work in entertainment circles as a practicing Catholic. You're persona non grata unless you're behind the camera and not in front.