If you were born into a Muslim family, you would probably now be a Muslim. If you were born into a Jewish family, you would probably now be a Jew. If you were born into a Christian family, you would probably now be a Christian, etc. Each religion indoctrinates and conditions its own flock...To think that their religion is the correct one...And who is to say that it isn't? All religions that promote peace, love and compassion for our fellow man are equally correct and valid
This is an age old problem and it will never change. There are extremes in all religions, politics, and cultures. It isn't difficult to identify them. It's simply the human condition. Radical behaviors are found in Christians, Muslims, Atheists, Democrats, Republicans, LGBT activists, PETA activists... Just to mention a few. Whatever cause it is there are, and will always be extremists who take it just a little too far.