I'm not catholic, and one time someone tried to give me **** for having an angel on my back, while I don't follow that faith. I had to then gently remind them that the Catholic church has renounced the existence of angels. Sounds weird, but it's true.
HAHA, don't worry about it too much. That might not even by true, I was always skeptical, but I figured the guy knew what he was talking about as he was a religious studies teacher. He said that they still talk about them in sermons for the same reason that they still have the nails going through christ's hands on the crusifix, becuase it's more about the symbolism than the fidelity of it. (Because it's been proved that the nails had to go trough the writsts, because the palms couldn't support the weight of a person for that long.)