Thanks!
I think the 'coverup' is actually one religion re-writing a previous one and editing out the parts that disrupt an illusion of them being the same.
Christianity wants to believe in a 'Trinity' of male deities. Was a 'trinity' actually there? This paper argues that the 'holy spirit' is a flow of energy.
As you say, there's "In the beginning the gods" and the idea might be that 'God' is a kind of surname, a reference to a family. The Jesus story is a succession story. The 'Son' grows up and takes over from the Father in the usual way this works on earth.
As to your question, how the more orthodox Jew in 'Jason and Papiscus' is convinced of the 'allegorical reading' , the descriptions call Papiscus an "Alexandrian Jew" which suggests he is familiar with the OT being discussed as allegory, this being the view of Jews like Philo, etc. But the Christian does seem to have made an even more broad case that the OT is an allegory, with reference to versions of the Bible that do not now exist.
