It's not really about Muslims being 'bad' at their religion. This is from the article I posted up earlier, a plea from a Muslim to other 'moderate' Muslims to explain to non-Muslims just what is currently going on:
For starters, it might help to read not only the Quran, but the other Abrahamic texts. When you do, you'll see that the Old Testament has just as much violence, if not more, than the Quran. Stoning blasphemers, stoning fornicators, killing homosexuals -- it's all in there. When you get about ten verses deep into Deuteronomy 20, you may even swear you're reading a rulebook for ISIS.
You may find yourself asking, how is this possible? The book of the Jews is not much different from my book. How, then, are the majority of them secular? How is it that most don't take too seriously the words of the Torah/Old Testament originally believed to be the actual word of God revealed to Moses much like the Quran to Muhammad yet still retain strong Jewish identities? Can this happen with Islam and Muslims?
Clearly from the above, the answer is a tried-and-tested yes. And it must start by dissociating Islamic identity from Muslim identity -- by coming together on a sense of community, not ideology.
Finding consensus on ideology is impossible. The sectarian violence that continues to plague the Muslim world, and has killed more Muslims than any foreign army, is blatant evidence for this. But coming together on a sense of community is what moves any society forward. Look at other Abrahamic religions that underwent reformations. You know well that Judaism and Christianity had their own violence-ridden dark ages; you mention it every chance you get nowadays, and you're right. But how did they get past that?
Well, as much as the Pope opposes birth control, abortion and premarital sex, most Catholics today are openly pro-choice, practice birth control, and fornicate to their hearts' content. Most Jews are secular, and many even identify as atheists or agnostics while retaining the Jewish label. The dissidents and the heretics in these communities may get some flak here and there, but they aren't getting killed for dissenting.
This is in stark contrast to the Muslim world where, according to a worldwide 2013 Pew Research Study, a majority of people in large Muslim-majority countries like Egypt and Pakistan believe that those who leave the faith must die. They constantly obsess over who is a "real" Muslim and who is not. They are quicker to defend their faith from cartoonists and filmmakers than they are to condemn those committing atrocities in its name. (Note: To their credit, the almost universal, unapologetic opposition against ISIS from Muslims is a welcome development.)