Well if you are Abram in the city of Ur then you believe in a pantheon of gods for different purposes. Nobody is certain what "Ur of the Chaldeans" meant, but it is safe to assume it was a polytheistic culture. If Abram had followed the model of modern Christians then he would have tested the message from God against the religious texts of his culture and found a disagreement, and Abram would have then rejected the voice of God.Sure, what does that have to do with rejecting the idea of one God above all?
The OT and NT were once open to new developments. These texts collected theological insights from different people at different times. Later these religious texts became closed and became a barrier to innovation and refinement of theology. Keeping things the same is great if you have everything correct, but these texts developed gradually. The Abrahamic religions developed gradually. How do we know there are no further changes required?
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