Which was the first major world religion to teach the idea that there is only one God?

Judaism

Explanation:

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Jews regard Abraham (as he was later called) as the first Patriarch of the Jewish people. Abraham was the first person to teach the idea that there was only one God; before then, people believed in many gods. Ironically, Abraham's father, Terach, had made his living selling idols of various gods.

more than 1 person for sure

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