I don’t think this is fair. Muhammad lived during a very violent time, and did what he could to make it less violent, and more just. He was not always successful, and certainly not the “perfect man“ that many Muslims say he was, but he tried. I support anyone who chooses to leave Islam, or any other religion, but what the author calls Islamic fascism is a corruption of Muhammad‘s original principles. more on this here:

https://www.academia.edu/33842907/If_I_were_a_Muslim_Thoughts_on_the_Abrahamic_Tradition_by_an_American_Buddhist