Second, as a Catholic, I've learned that contrary to what many non-Catholics believe, not everything that is said by a member of priesthood is unchallengable "doctrine", and thus, we're not actually some army of automatons that just follows a script. Honestly, I sort of thought those kinds of assumptions had gone out the window with turn-of-the-last-century anti-Catholic bigotry.
But third, let's take your point seriously. What the Catholic church does proscribe - and to my knowledge, most Abrahamic faiths proscribe - is fairly simple: thou shall not kill. Now, can guns facilitate killing? Sure, though they do have alternate uses. But, please sleep comfortably (I will), knowing that while I respect our civil (non-Catholic) society's decision and traditions permitting gun ownership, which have actually been incorporated into our foundational law, I have never shot a gun, do not own a gun, and have no interest in doing so - in part because I don't find them interesting, and in part because I'd never actually use one against another human being, no matter how much shit they threatened to take from my house or my life. So, I'm doing my small part, which I hope makes you feel better.
