Is Christianity based on older myths?

[Mister Agenda]

Sure I understand that. But at some point in the causal chain of belief, someone had to start the lie.

That's your claim, and you haven't supported it well at all.

After reading the epistles you would have to assume the lie started with the actual disciples (with or without Paul's involvement).

Would you please stop telling us what we have to assume? Your record so far is poor enough that a little humility concerning your own ability to deduce our thoughts is in order. We don't have to assume any such thing. We don't even have to assume there were disciples. A good rule in reasoning is to assume as little as possible.

Relevant to this thread, that would mean the Galilean fisherman borrowed from ancient myths (with or without Paul's help) to concoct the story they would tell as true.

Given the time between the fishermen and the Gospels, the original story of Jesus could have been utterly myth-free and accurate beyond any reasonable expectations when they told it. Given that, decades of retelling would still certainly profoundly corrupt the original tales.