The downfall of Islamic Spain was certainly a major contribution to the halt in Islamic scientific discoveries.Smiling Bandit said:So what's the reason then for falling behind so much if not for Islam itself? Look at how much Christianity stalled western development until the reforms. It certainly appears that they made these achievments despite Islam not because of it. A restricting dogma never has advantages on free research.
Many significant inventions in different fields came from Islamic Spain in what is considered the Golden Age of scientific Islam.