Islam didn’t start for a coule if hindred years or so after Rome fell.
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the muslim invasions destroyed countless libraries and people with knowledge in their war on Christianity and other traditional religions. There remained only what some muslims thought useful to them. The rest was burned. There was nothing and no one to pass down knowledge after the fall of Egypt, North Africa, the Levant, and Persia. 200 years after the fall of Rome, which itself was sacked and burned. By 1500 AD people were just beginning to recover what had been lost, and it was not until the middle 1800s that large ship building recovered.
Why We Are Afraid, A 1400 Year Secret, by Dr Bill Warner
https://www.youtube.com/watch?v=t_Qpy0mXg8Y
Bill Warner PhD: Half Truth of the Islamic Golden Age in Spain
https://www.youtube.com/watch?v=RDWvW-ITF7s
“The populace realized concrete was racist during the Middle Ages and stopped using it. Then we went backwards again later, and it’s only gotten worse ever since. Allahu Ackbar.”
-6th Grade History Schoolbook, 2021