Speaking of secularising the muslim majority countries. What do you think about Mustafa Kemal Ataturk?
Two things were crucial in my opinion when Ataturk came to power
1. A 100 years of reformation, where the Ottoman State stopped using most of Sharia, including the penal code which meant that apostasy was legalized
2. The average muslim Turk probably knew nothing about Sharia except basic things.
It would be unlikely that a saudi king would be able to do what Ataturk did.