You make an excellent point. Bahadur's methodology seems to me like it might work, but it does introduce some theological and ethical questions. He makes the case for Muslims by OT prophecies about God calling people from the east. The lifestyle matters are not only OT, but very identity focused as opposed to Jesus-focused—and where is the Pauline freedom in Christ? Romans 14, for example? Are we being honest in acting as though we're unrelated to other Christians? 

Nonetheless, after listening to it, I think Bahadur is on to something—as long as aware of dangers, particularly in the matter of transparency.