I'm not convinced by mythological theories about Jesus. The gospel writers tie themselves in knots to try to make his story align with Old Testament references. They would not do that if he was made out of "whole cloth".
The latest and most compelling attempt to explain Jesus as a mythological character was made by Richard Carrier - "On the Historicity of Jesus: Why We Might Have Reason for Doubt".
Jesus ... rejected much of the scriptures of his time - Venus
No he didn't. He was passionate about the Law and taught his disciples to follow it meticulously. He rejected the way the OT was being interpreted by the Pharisees.