It's a matter of belief. I made the assumption that those people "probably don't care", implying they probably don't believe that something like that's a sin. When you don't believe in it, you're not a Muslim. If they still believe in it and yet do it, it's a major sin indeed, and they are still Muslims. But Muslims possibly bound for hell.
'Killing the infidels' isn't a requirement of action nor are you bound by belief to do so to be a Muslim. Can you cite a full Surah from the Qur'an where this is unequivocally required of Muslims, under all circumstances?
'Killing the infidels' isn't a requirement of action nor are you bound by belief to do so to be a Muslim. Can you cite a full Surah from the Qur'an where this is unequivocally required of Muslims, under all circumstances?