For all purposes it is safe to assume that no atheist has ever made such a statement ever. Can you refute that? You've said no.
The New Testament: It is reasonable to assume that earlier documents could have influenced later documents, that the narrative that was passed down could have been fabricated by even a single person, and that documents that were not included in the NT were the ones that did not corroborate the narrative. The Jews certainly don't acknowledge any support lent to Christianity, the Koran was absolutely influenced by the New Testament, not a corroboration of it. Roman historians generally acknowledge Christians and their beliefs, but not the substance or accuracy of the Christ narrative.
I disagree, but let's say that it is true. What is that evidence of?
What needs to be refuted? Let's assume that Jesus existed, James and Paul both believed he was God, that they believed they saw a risen Jesus, and the tomb was empty.
What is that reasonable evidence of? Tell me about doubting Thomas.
Yes. But that's poor evidence. Nazareth, Pontius Pilot, and a Census are evidence of the existence of Jesus like New York, Ronald Reagan, and the Vietnam War are evidence of Captain America. It is easy to write fiction using real places, real people, real events, and real historical climates. In fact, the majority of fiction is created that way.
Let me subtly point one thing out. When Jesus walked on water to the apostles, why was such a miracle necessary? Wasn't it just egoism? Showing off? What was the point?