Why do you think that killing - be they Muslims or others is correct? I am a Muslim and I do not believe in killing, we have been taught by the Prophet that "the one who takes a life is as though he has taken the life of all mankind, and the one who saves a life is as though he has saved all of mankind"
We are not all killers, do not paint all Muslims with the same brush. Just because one German (Hitler) killed 6 million Jews doesnt make all Germans evil, the same goes for Muslims, those who kill for their own reasons and state they are doing it for Islam will surely burn in Hell for a long time.
I live in England and get on well with Christians, Hindhus, Jews and Buddhists - we should learn to tolerate each other and not kill.
Peace to you
Mumin