Again wrong
Was Jerusalem/parts of the Roman empire, Egypt or Persia captured during the Abbasid period? Did the local people convert during the Abbasid time?
True but the It gave a the Romans/Europeans a unifying glue and a sense of purpose more than any of their pagan philosophies could. It even unified them to push back the Turkish and Moorish invasions
Prosperity does that to you. You start claiming to be god or starting inventing them and even start denying him altogether. Believing in a ONE True God has always been a problem with mankind
How is believing in made up regional deities that have the same desires and fighing over petty things like ordinary humans a good thing?
Where exactly in the Quran does it say that? The Quran itself classifies mankind into believers and non believers unlike the Bible which addresses the Children of Israel. If anything the Quran itself calls the Arabs, Umeyeen (The Ignorant), Sura Juma
That may be true for older religions with their regional limitations but Islam with its universal message and appeal is free from such geographical constraints. In fact Islam through it's missionary activity, trade and wars was able to bring the world together like no other movement.