bro, as far as I know, kafir, a word means someone who isn't following their religion in Arabic. Like if a Christian saw someone not following his religion, in Arabic, he can call him kafir, which means you don't believe in what I believe in. It's not actually a bad word, or a curse or something. and I thought about Muslims being called terrorists before, but logically, that is BS, since there are 1.5 or 2 Billion Muslims in the world. Can you imagine if that's true what would happen in the world xD?