There is no hope for who's brainwashed since their childhood. They probably will never wake up out of this matrix. They don't even have that part of their brain to think differently , that could be the reason they are so violent and merciless. Like Truenepalidude wrote, you can't do anything for them. Extreme religious beliefs are like incurable cancer cells for humanity.  They who kill another fellow human, in my eye, couldn't be a human, they're mentally challenged violent animals who just look like human.