Augustus
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Golden Age of Islam a thousand years ago in which Muslim scholars basically saved the world's ancient sciences and literature?
They "saved" basically none of the science from the Graeco-Roman world and were largely uninterested in the literature. The Graeco-Roman Byzantine Empire preserved everything we have today too.
What they did do was progress numerous scientific fields.
And that in the last century, Islam has basically stopped bothering translating any of the world's science and literature into their own languages? Because I believe those things are factually correct.
But basically saying "because al-Ghazali" is not remotely accurate.
What happened was that the Islamic Empire fragmented into numerous smaller empires that were frequently at war with each other (I posted a short video above that shows this pretty clearly). They then got conquered by the Mongols, and changing patterns of world trade further damaged their empires.