I suspect you'll like this answer.
The Assyrians, 740 BC, had a pagan god named Sin and the crescent moon was its symbol. The god Ishtar had a star as a symbol; in addition they held other deities of which Assur was the main one, (star and crescent moon are over the Kaaba). The Assyrians were known for beheading captives and impaling the decapitated heads upright, (very much like Caliphs and Sultans that followed Muhammad only they made pyramids out of decapitated heads). The Assyrians considered warfare a requirement of their religion; their priests would constantly demand warfare because it was a show of their faith, (very much like Islamic Jihad of today).
The Assyrian main city was Nineveh. In the Old Testament book of Jonah, G*d tells them to turn from wickedness and they did...it is the only instance where G*d preaches need for repentance outside of Israel. A century later, the book of Nahum records the destruction of Nineveh because it returned to its wickedness. Babylon took over the Assyrian empire. Today, Nineveh has been found and is undergoing archeological digs.
I am glad you brought up this topic. Look at the Assyrian god Assur (wikipedia), it looks like an angel, a man with wings... exactly identical to Muhammads fallen angel that brought the Quran. The Assyrians and Islam have many similarities.
Futuwwa, your explanation of the Ottoman empire is 1500 years off.