Rubbish.
During the golden age of Islam, roughly around the same time as the golden age of Ireland (8th-10th centuries) medical knowledge in the Islamic world grew at an extremely rapid pace - medical practice on that level was not reached in backward benighted Europe until maybe the mid-19th century.
The knowledge was there, the intelligent people were there - only the sad old peasant grovelling mentality and the pathetic backward systems of hierarchical control kept Europe stagnant for centuries.
Any reading of global history quickly points out who the villians are, time and time again. Fearful reactionary conservatives, afraid that if the herd start thinking for themselves they will lose their privileged positions. Again and agin all through human history, the same gobsheens f*** it up every single time.
John waters another shameless self publicist,Eurovision Winner and successful club footbal manager!