I'm sorry, but I have to respectfully disagree =) None of the Abrahamic religions are all that peaceful actually. They all feature and legitimzes violance and slavery. What's WRONG with religion is their Holy Books, and Islam has the Hadiths on top of that
The Abrahamic religions are based on morality and principle before the eyes of a creator. All three of them.
The jews have a responsability before God to be faithful to his commandments (Thou shalt not kill, thou shalt not covet thy neighbor's wife, ...) lest they suffer his wrath.
The christians are called to follow in the footsteps of their messiah (if someone hits your right cheek, give them the left cheek).
The muslims have a whole law prescribing them how to be fair to those around them.
There are aspects in the books of the respective three religions that could empower a psychotic person, but almost always to the detriment of the laws and moral principles in the book itself.