.... "You can find beauty within Islam itself," he tells the audience. "It's an amalgam of many, many ideas. Some are good, some bad.
"A lot of them are outdated, because it was the 7th Century. It doesn't mean they're all bad. Personally speaking, one of the better things in Islam is the emphasis on charity."
The talk ends with questions - some from Muslims, some from non-Muslims. They are all respectful. The policeman sits by the door, legs crossed, interested.
Before the talk, Muhammad admitted he had doubts. Not about leaving Islam - but about whether being a well-known ex-Muslim was worth it.
"Of course, everybody has those moments," he says. "It's normal, it's human. Is this worth the toll it's taking on me?
"But on the flip side you also see the good you're doing. You see the people who were suffering in bad situations [who are] doing great now.
"It's heartening to hear those stories - to hear how we've affected their lives." [BBC] Read more