Why atheism always has a burden of proof

[Esquilax]

There are multiple attestations of Jesus the Christ who was raised from death!

The gospels aren't evidence, the gospels are the claim. Claims can be written down too, you know.

Who would have made all of this up and what would be the motivation? Even if Jesus was just some kind of a wandering lunatic there's no reason to say he was a pure invention myths are generally based on something.

Power, money, control over people, varying other sociopolitical aims depending on context, and that's only accounting for the possibilities of outright deception. It's also entirely possible the writers were just genuinely mistaken, or terribly credulous, perhaps insane, or brain damaged in some way.

All of these possibilities are more likely than the claim you believe in, which falls victim to Occam's Razor quite spectacularly.