Never ever. Only if Muslims are invaded, by Christians or others, Muslims are required to defend their lands and to defend their people. Otherwise, Muslims are commanded, per religion, to live in peace and harmony with people of all religions, cultures, colors, and races; including Christians.
In Quran there are many verses commanding Muslims to keep kindness and respect to other religions.
In the Quran, Holy book of Islam, God says(meaning English Translation):
" God does not forbid you from showing kindness and dealing justly with those who have not fought you about religion and have not driven you out of your homes. God loves just dealers."
[Quran,chapter 60,verse 8]
Muslims are Not terrorist. go Study Islam and see for yourself
ISIS is a fanatic organization. It does not want to kill Christians. It wants to establish a state of its own kind of Islam. ISIS people interpret Islam in their own way. They kill even the Muslims who do not agree to their interpretations. They not only dangerous for the Christians, they are equally dangerous to the Muslims.
There are cases where believers of ANY religion have a perfectly valid reason and both the right and duty to kill another human being. Different religions set different boundaries on this and some people deliberately misinterpret what their religion says on this matter for their own reasons having nothing to do with the religion that they claim to believe or represent.
The Prophet Mohammad preached for Muslim followers to bring people to Islam and if the non-believers still refuse then it is the Muslim's duty to kill those people. The core of Islam does not preach peace, but violence. However, in the Muslim belief, the violence is justified.
Islam does not teach Muslim to kill. Please look at the Al-Qur'an.
if no one want to kill Muslims Islam will remain the religion of peace. Islam does not start war. but Islam has Jihad for defend against who want to kill Muslims.
The Caliphs needed the expertise of the conquered upper classes as concerned banking and general administration. Additionally, non-Muslims were more heavily taxed, which resulted in higher state incomes and most Caliphs preferred to live in luxurious palaces. Finally, in contrast to previous religions, Islam did not require its believers to kill all who are not Muslims.
The Caliphs needed the expertise of the conquered upper classes as concerned banking and general administration. Additionally, non-Muslims were more heavily taxed, which resulted in higher state incomes and most Caliphs preferred to live in luxurious palaces. Finally, in contrast to previous religions, Islam did not require its believers to kill all who are not Muslims.
Kill CHRISTIANS
No - why?
They didn't.
Islam