I do think it's important to acknowledge the good that is in people of each denomination, even when there are disagreements on pretty important doctrinal points. Obviously I'm not Catholic or Protestant, but I will readily acknowledge that I have met many Catholics and Protestants whom are fully devoted servants of God and there are admirable beliefs in each group. And yes, every single group also has sinners and problems.
My awesomely sweet Grandmother was a very devout Catholic. She played the organ for almost 40 years at a large Catholic Church in my area. I used to sit up there in the balcony as a child allot and suck on her black fisherman's lozenges, lol. That woman never exhibited anything BUT the fruits of Gods Spirit and I have no doubt where she is. Catholic or not. JMHO :)