"Why are people so proud of being half assed about their religion?"

This was Rose's question after we'd been talking about various progressive Catholic opinions seen around St. Blogs in the last few days.

Good point.

Saint Thomas Aquinas ... says if a Catholic comes to believe the Church is in error in some essential, officially defined doctrine, it is a mortal sin against conscience, a sin of hypocrisy, for him to remain in the Church and call himself a Catholic, but only a venial sin against knowledge for him to leave the Church in honest but partly culpable error.

Peter Kreeft

Further thoughts about that subject can be found here.