https://upload.wikimedia.org/wikipedia/commons/thumb/8/80/Islam_attitudes.png/600px-Islam_attitudes.pngYou haven't even explained how this would actually work. While countries like Banglesdesh would be easy to invade, you will run quickly into the problem of certain countries being extremely militant in general. Pakistan and Turkey are ones for example. Both have large militaries, both have been involved in conflicts, and Pakistan is nuclear armed. Both are large in regards to population, have some good defensive terrain and have allies who wouldn't take lightly to your crusade. In regards to Africa, there are numerous states with small to mid sized militaries that could conscript and defend some key points, like the region of Africa where only the coast is really usable in regards to military advancing, and the Suez Canal, which could be closed off. The Sahara would provide a good defensive barrier.
Edited 8/21/2016 21:19:18