Your bad character can drive Muslims out of their religion

When you hear about someone leaving Islam, you may imagine it has something to do with religious beliefs. On some technical level it surely does. But I think the reason usually has nothing to do with, say, rational rejection of one of the six pillars of faith. Rather, most people I've known who left Islam did so because they became disillusioned. And nothing causes a Muslim to feel disillusioned about Islam but the bad character of other Muslims.