After the Tawaf - walking around the Kaaba, the cube-like structure at the centre of the GreatMosque in Mecca - we will offer two rakaas or units of prayer, followed by drinking water from the holy Zam Zam spring.
But the Pope's supporters will be hoping that by visiting Muslim holy sites - he was the first pontiff to go to the great compound of al-Aqsa mosque in Jerusalem - he will have improved the overall tone of relations between the Catholic Church and some at least of Islam's believers.
No doubt KSM and his followers at Guantanamo take great satisfaction in such high-profile support of the Ground Zero mosque and have exclaimed, "God is great!"