The aspect of Allah being one alone did not originate from Arab influence due to their ancestors being polytheists.
I find it strange that the Arab culture would adapt the monotheistic views of a foreign culture based on the beliefs and influences of both Jews and Christians.
The basis for Islam has its roots in the conscious, conviction, and proclamation of a foreign faith. Why wouldn’t the all sovereign and supreme G-d who is the king of the universe originate truth with the ones who would eventually make claims to bearing its message (Muslims) unless it was really only just another source of deviation, falsehood, and corruption? Who borrowed truth from whom? Who influenced who here? Is it possible to pick and choose the aspects of religion that correspond with Islam’s personal worldview for the sake of possessing a unique identity? There are many cults that likewise come up with new revelations. Just study about the Jehovah Witnesses and the Mormons who have a similar experience to Islam. Joseph Smith like Muhammad was seeking truth and He likewise received a personal revelation through an angel. Of course Joseph Smith’s angelic visitation had its own unique message and translation that was much different from the angelic revelation as given unto Muhammad. So who is right? The famed Joseph Smith who know has one of the fastest and largest cults worldwide or the likes of Islam who is the fastest growing religion with over 1 billion adherents
The apostle Paul warns about this phenomenon before Islam was birthed or before Joseph Smith was a twinkle in his mother’s eye and he states in Galatians 1:8 that even if a angel from heaven should preach a gospel other than the one we preached to you let Him be eternally condemned.