There is a difference between the Idea of Islam,
And the implementation of the idea. There are several implementation around, but the most brutal implementation is based on either Saudi Islamism.
You ever wonder that Islamists are the least developed today?
Forget about 500 years ago or 1000 years ago time. Anyone can romanticize the history and fill with it with whatever garbage (or flowers), or misinformation.
You ever wonder that from the Islamists’ heartland of Saudi, not a single big name invention has come in the last 1000+ years?