Something they "inherited" from the Jews. Jews aren't supposed to eat pork either. In reality, I suspect the basis for it is not so much that they unclean but that their metabolism is too close to ours. You can catch things from Pigs, the worst of which might be trichinosis. Also anything pig can eat, you could eat and "cut out the middleman" so to speak. As they do with other things, the Musslemen just carried things to a ridiculous extreme.
Still nothing like a good pork chop, a pork roast, or a nice Easter Ham.
I eat bacon and enjoy the heck out of it. But that's probably because it's smoked meat. Uncooked pork's gross to me. Something about the smell. Yeech. Oh well. Still love a filet minon though. Guess I'd be worse off in India based on my dietary preferences.
It's interesting though --- Muslims are also very superstitious about dogs --- they're afraid of them and won't enter a room where there are dogs. They got that from Mohammed himself who decided dogs were devils.