"you can not find such ruthless violence in any other religion (Hinduism, Baha'i, Sikh, Buddhism, especially not Christianity). "
Did you type this with a straight face? Do you seriously believe that Christianity has never exhibited ruthless, violent behavior? Seriously?!? I suggest you read some history regarding the spread of Christianity, and it's destruction of native cultures, often to the point of (and sometimes beyond the point of) genocide.
What I meant was within the religion itself. As in, you never once hear Jesus say "slay the infidels wherever they may be" or things of this natured. Nor any of the main prophets of the religions I listed. Men do stupid things in the name of religion, but that doesn't mean the religion is the fault of it. That applies to Islam too.