Yeah, this is taught in Christianity.
However, Muslims have strict guidelines to follow and if a Muslim is to follow the guidelines of the Hadiths, the Koran, and Islamic Sharia law completely; then the outcome is obvious to Islamists because this means the implementation of laws which infringe on the rights of non-Muslims and limits the freedom of moderate Muslims.
If we return to Ramadan and why Islamists continue to kill during this so-called holy period then I would state that it is because of the nature of Islam itself.
Mohammed stated to (Koran 9:29) “Fight those who do not believe in Allah, nor in the latter day, nor do they prohibit what Allah and His Messenger have prohibited, nor follow the religion of truth, out of those who have been given the Book, until they pay the tax in acknowledgment of superiority and they are in a state of subjection.”
Of course apologists or liberals will gloss over this statement and countless others; however, for Islamists or normal Muslim religious leaders in Afghanistan, Pakistan, Saudi Arabia, Somalia, and many other nations, they firmly believe that it is their duty to Islamize the nation state and then to spread Islamization and to install a new Islamic caliphate where the nation state is unimportant.
Despite this, in history it is clear that Islam was never united because divisions soon engulfed Islam and early Muslim rulers were often killed by Muslims. However, from the very outset of Islam it was clear that violence was part and parcel of the Muslim faith because Mohammed ordered attacks against Jews and Pagans.
It is clear that Mohammed did not support the concepts of either the Buddha or Jesus. After all, the Buddha and Jesus were not interested about military power or state sanctioned control and they never ordered the killings of others or inflicted violence towards others.
Mohammed, however, states the following:
“O Prophet! Make war against the unbelievers [all non-Muslims] and the hypocrites and be merciless against them. Their home is hell, an evil refuge indeed.” (Koran, 9:73)
“When you meet the unbelievers in jihad [holy war], chop off their heads. And when you have brought them low, bind your prisoners rigorously. Then set them free or take ransom from them until the war is ended.” (Koran, 47:4)
“The punishment of those who wage war against Allah and his messenger and strive after corruption in the land will be to be killed or crucified, or have their hands and feet and genitals cut off, or to be expelled out of the land. Such will be their humiliation in the world, and in the next world they will face an awful horror.” (Koran, 5:33-34)
“When we decide to destroy a population, we send a definite order to them who have the good things in life and yet sin. So that Allah’s word is proven true against them, then we destroy them utterly.” (Koran, 17:16-17)
“In order that Allah may separate the pure from the impure, put all the impure ones [all non-Muslims] one on top of another in a heap and cast them into hell. They will have been the ones to have lost.” (Koran, 8:37)
“How many were the populations we utterly destroyed because of their sins, setting up in their place other peoples.” (Koran, 21:11)
“Remember Allah inspired the angels: I am with you. Give firmness to the believers. I will instill terror into the hearts of the unbelievers: you smite them above their necks and smite all their fingertips off of them.” (Koran, 8:12)
Qur’an-(5:51): “O you who believe! Do not take the Jews and the Christians for friends; they are friends of each other; and whoever amongst you takes them for a friend, then surely he is one of them; surely Allah does not guide the unjust people. “
Qur’an-(9:5): “But when the forbidden months are past, then fight and slay the pagans wherever ye find them, And seize them, beleaguer them, and lie in wait for them in every stratagem (of war); but if they repent (accept Islam) and establish regular prayers and practices regular charity then open the way for them; for God is oft-forgiving, Most Merciful.”