OK, let's try a less incendiary variant of the locked 'Destroy the Kaaba' thread from the After 1900 forum. WI the Kaaba never becomes a Muslim shrine? For instance, WI the Prophet Muhammed had given orders for the Kaaba to be destroyed when he visited Mecca ITTL, instead of merely demanding the removal of all of the idols inside before entering it as he did IOTL? How much more different would Islam have become ITTL without the Hajj and the central role of Mecca? And how much more different would the world be as a result?