According to the Qu'ran, Mohammad (PBUH), communed with Allah and received a set of new commandments, which added to the Bible/Torah's list (if I'm understanding it right), and his father was named Abdallah, which translates to "Servant of Allah", however, my research has ended there for Muhammad's past (PBUH), before he became a Prophet of Allah.

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As such, was Muhammad (PBUH) part of an Abrahamic religion beforehand, and if not, why would he have communed with a god in which he supposedly did not believe?

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some background: I'm an atheist 18 year old who wants to know and understand more about this thing called "religion" that dominated humanity's past for more than two thousand years