@Intransigent Southerner
Semitic was more than a mere substrate to the various languages of Mesopotamia. Semitic didn't become dominant in the region instantly. It took several hundreds of years of contact with other languages until the different Semitic languages were formed and most of them were formed not through a centralized power, but at a local level. And the languages that came from them didn't just derive from Semitic, it derived mostly from the various local languages that existed at the time, resulting in a "original" language.
That is correct, I didn't not know this. I give my deepest apologies.
No. I meant a language which incorporates both Arabic and Persian to give arise to something entirely different.
@The Professor
You mostly right, however it isn't a conlang, it's developed in a local level and is given official status as a language. Furthermore, the Arabs have more than just a spiritual role which is a change from OTL and thus, do have powers which may step over the boundaries of temporal while the Persians also have some power in the spiritual realm, not just temporal power.
However overall this was a good post and I learned a lot of things which could help me in the TL I'm making. I appreciate the time and energy it must've took you to write such a high-quality post.