It's true Islam started to degrade when they started to assasinate mathematician & all in 15th century and focus on hallal burka mekka & all, too bad .. it still created lot of good things in the days
The thing killing Islam is wahabism. .
And then... the thing that will ultimately kill Islam is
The Difference Between Sunnis and Shiites. We are being sold Islam as a unified religion. Not true. They hate each other.
Islam has never been unified, ever .. they have no clergy, no pope. It's always been made that way.
Dispute between clans or schools are normal and healthy to a degree.
It was never made to be unified around a central authority as the catholics.
But wahabism is really ultra litteral interpretation, with totalitarian mindset, based on simplistic litteral materialistic and politic interpretation that is supposed to be the only way to understand it.
Much more dangerous to the true essence of the religion than dispute between different branches.
This happened before in the Christian world with protestants and catholics, only the free mason could put an end to the war with principle of republic.