Here is the claim - That the Flavian Dynasty created Christ to quench the religious tension or combine beliefs with Egypt and is basically just another “pagan” origin myth of sorts.
Ahmed Osman, a British Egyptologist makes the claim that “some early Christians made no distinction between Christ and Serapis and frequently worshipped both, while paintings of Isis with her son Horus became identified by early Christians as portraits of Mary with her son Jesus. The rite of baptism, part of the initiation ceremony of the Serapis cult, was also adopted by the Church as part of its initiation ceremony.”
He later states - In AD 134, after a visit to Alexandria, the Emperor Hadrian wrote a letter to his elderly brother-in-law, Servianus, in which he commented: “So you praise Egypt, my very dear Servianus! I know the land from top to bottom . . . In it the worshippers of Serapis are Christians, and those who call themselves Bishops of Christ pay their vows to Serapis . . . Whenever the patriarch himself comes to Egypt he is made to worship Serapis by some and Christ by others.”