If they do, they are advocating and perhaps commiting murder and other evil things.
If they don't, they aren't really Muslims. It's simple.
It's not tough at all. Either they believe in the Koran or they don't.
If they do, they are advocating and perhaps commiting murder and other evil things.
"And seek not occasions for mischief in the land: for Allah loves not those who do mischief"
Beware of excesses in matters of religion. For, as a matter of fact, those before you were destroyed by religious immoderation"
"He who kills himself with anything, Allah will torment him with that in the fire of Hell"
"...If anyone killed a person not in retaliation for murder or to spread mischief in the land, it would be as if he killed the whole of mankind. And (likewise) if anyone saved a life, it would be as if he saved the whole of mankind"
If you want we can swap verses until the cows come home.