It is very obvious that Islamic religion/ people kill many Christians all over the world. Although the Bible says, do not murder, they still practice it. What would be the reason.?
I think there are no Muslims who deliberately kill Christians without reason, Islam is a loving and strict religion.
Islam is a peaceful religion, does not teach Muslims to act rude or evil to fellow human beings or even to the enemy of Islam.
so there is no reason for the Muslims to kill good Christians, who can respect each other, Muslims will only fight against Christians who commit malicious acts against Islam, and Muslims are allowed to kill every evil person and harass the Islamic religion.
The reason is just one that any body that kills, be he a Muslim, or a terrorist ,.....etc does not Fear the Almighty God that created All humans ,and also commanded that thou shall not Kill or commit Murder. And any one that Kills has gone against God's Command and have sin against God.