China has just banned the burqa in its biggest Muslim city

[Samus Aran]

MohammadBadir said:

The Caliph was just a religious leader for centuries due to the political stuff becoming the Sultan's business.

You're right that the caliph eventually became a mere figurehead, but that doesn't contradict anything I said. It merely shows the weakening of the caliphates (unable to hold a huge empire together).