The original Christianity is not what is in the Bible

[Bad Writer]

I don't claim to know for certain that the OP is right that the Gospels came after Paul wrote his letters, but what you're suggesting is that Paul preached the Gospels that hadn't been written yet. This is the point you need to address: that the Gospels existed in the same form as they were presented in MMLJ when Paul was preaching his schtick. This is your claim, and I find it hard to support in light of the OP's research about how the Gospels actually came after the works of Paul.