A simple challenge for atheists

[Esquilax]

That does not make sense. If a fifth gospel was found, written by the apostle Andrew, an eyewitness to the events. Would The Gospel According to Andrew be a claim or evidence?

It would be a claim, the same as the other four gospels. If I paid five people to say that I was god, would you believe them, or ask for something more? What if, when you asked for more evidence, I pushed one guy of my group of five and said the evidence is that he said I was god and he says true things? And when you asked why you should believe that one guy, I point to the other four and say that they agree with him and say true things too?

Would you believe I'm god, then? And if not, why would you believe the claims of four anonymous guys, concerning a person we can't even properly ascertain existed?

If Joe the Jew did the same but did not state he was a Christian, would that somehow change from a claim to evidence?

Nope.