I guess I was thinking about it not so much as Islam vs. Christianity as in terms of her looking for a belief system that tells her what to do at all times. For a way of living, IOW, that means she doesn't need to engage in any introspection - just ask the imam what the Koran says to do and then obey.
Interesting angle, and you're very likely right.
It's all about behavior and outward forms; Christianity is more about the heart. Mind-numbed robot vs. free will.