Oooh, I love Catholic tattoos. If forced at gunpoint to get a tattoo, I think I'd get the immaculate heart.

I think there's a difference between being respectful to the Catholic religion and committing a sin/angering God. I would never argue that God is looking down on us and trying to see who's defiling rosaries by wearing them as necklaces, but I would argue that there are many Catholics who would be offended by the sight of seeing someone wearing one.

Whether or not you choose to care about their feelings on the matter is totally up to you.