Muslims and Jews don't eat pig. We also don't eat anything that isn't Halal or Kosher. Basically, anything that wasn't killed in a very humane way, i.e. no suffering for the animal. It's a lot harder to avoid the latter.
I'm not ultra-religious or anything, if you couldn't tell, but I have avoided eating pork my entire life. It's really fucked up to think it was all for nothing.