I think the Muslim call to prayer is hypnotically beautiful, and when I lived for a while in North Africa, I tried to be awake in the early hours, to listen to the adhan rolling across the waking city like a sonorous tide.
I am not exactly pro-religious, in fact I stand against it, whatever the religion. However, I am not going to change the world, and there are people who do believe, as is their right, no matter how misguided I think it is.
That said, I am wary of Ch4 broadcasting it, in a way that some will perceive as intrusive, and "un-English". It may indeed provoke people, but not in the intended direction. Something like this could be inflammatory, rather than beneficial, and may encourage racism where there was none.