Perhaps Aslan would like to share the context of these "rules" with his readers (and to show us which of the rules, properly understood, ISIS is violating), along with the source. In the meantime, let me give some further guidelines from Abu Bakr. After Muhammad died, many Muslims left Islam, to varying degrees. Some fully renounced Islam or returned to their former religions, while others abandoned certain prescribed practices (such as paying zakat to the central Muslim authority). Abu Bakr decided to fight all of them until they returned to orthodox Islam.
Here are some portions of a lengthy letter Abu Bakr sent (along with an army) to the apostates and rebels. Unlike Aslan, I'll actually document the source so that people can take a closer look if they like.
Here are five takeaways from the underlined portions:
I have learned that some of you have turned back from your religion after you had acknowledged Islam and labored in it, out of negligence of God and ignorance of His command, and in compliance with the devil. . . . I have sent to you someone at the head of an army of the Muhajirun and the Ansar and those who follow [them] in good works. I ordered him not to fight anyone or to kill anyone until he has called him to the cause of God; so that those who respond to him and acknowledge [Him] and renounce [unbelief] and do good works, [my envoy] shall accept him and help him to [do right], but I have ordered him to fight those who deny [Him] for that reason. So he will not spare any one of them he can gain mastery over, [but may] burn them with fire, slaughter them by any means, and take women and children captive; nor shall he accept from anyone anything except Islam. So whoever follows him, it is better for him; but whoever leaves him, will not weaken God. . . . (The History of al-Tabari, Volume X, State University of New York Press, 1993, pp. 55-57)
(1) According to Abu Bakr, Muhammad "struck whoever turned his back to" Allah "until he came to Islam, willingly or grudgingly." Does Aslan agree with Abu Bakr that Muhammad compelled people to convert to Islam, whether they wanted to become Muslims or not?
(2) Abu Bakr sends the letter with an army, and the army is instructed "not to fight anyone or to kill anyone until he has called him to the cause of God." Those who returned to Islam were to be left alone, while those who refused to return to Islam were to be fought.
(3) Khalid bin al-Walid (the commander of the army) was ordered not to "spare any one of them he can gain mastery over."
(4) The penalties for refusing to submit to Islam included "burning them with fire" and "slaughtering them by any means."
(5) Women and children were to be taken captive.
As you can see, the Islamic State is following Abu Bakr's guidelines to the letter. Yet Reza Aslan invites Islamic State jihadists to follow Abu Bakr's guidelines. By telling jihadists to obey Abu Bakr, Aslan is telling them to (1) invite people to Islam, (2) slaughter those who refuse to submit, and (3) take women and children captive.
This is what happens when clueless Western apologists for Islam start sharing what they learned about Islam from their American professors. They toss around quotes that they copied from the internet, mocking people like Islamic State leader Abu Bakr al-Baghdadi (someone who didn't get his information about Islam filtered through Western universities). Such tweets help sedate the ignorant, but do nothing to stop those who actually carry out the commands of Islam.
For more on Islam and ISIS, watch this:
And here's my tweet to Aslan:
Aslan's response was to delete my comment. This means that he now knows that his selective quote is thoroughly misleading and deceptive, and that he simply doesn't care.