Thanks for posting this. It’s a good, well-reasoned article and -— conident it’ll be useful to me in the future -— I’m keeping my hands on it!
FWIW, if you're trying to witness to a muslim do it one on one, never in a group. In a group they will be compelled to defend their faith. Also, if you can get them to read Scripture it's the best way to get started. The Book of Luke is a great starting point.