The Golden Age of Islam was certainly creative - but it wasn't liberal.
Europe was then in a Dark Age of poverty and confusion due to : (1) the collapse of the Roman Empire, (2) attacks from Vikings, Magyars and (above all) Muslims.
Only thanks to Christianity and the Catholic Church did Europe retain its liberty and independence.
There is, of course, no conflict between science and religious faith - there can't be, since they deal with completely different fields.
The persecution of Galileo was due to insecure Vatican hardliners forgetting this.
Correct me if i im wrong but i understood that part of the reason for the fall of the roman empire was the subversion of the roman military, more precisely, the overthrow of the cult of Mythos
It is true that many millions died as a result of the various crusades.
And christianity perpetuated the dark ages by limiting education to the clergy only, it was a way of keeping control over the masses.
The dark ages ended because a few people broke the bonds of religion and educated themselves