Here's something to consider...
Why make a big deal about something that doesn't exist and the fact that you don't believe in it? Santa Claus doesn't exist, neither does the Easter Bunny or the Tooth Fairy, so of course I don't believe in them. They are not real, so it's easy to say you don't believe in something that you don't believe is real, for which there is no evidence. Anyone can do that, and it is silly to keep harping on the fact you don't believe in something that children do.
Now how about refusing to believe in something despite the evidence that it is real or true. For instance, I'm Jewish. As such I don't believe that Jesus was the promised Messiah. I believe, of course , that Jesus was real. I even believed he performed miracles, died, and was even resurrected. Like others before him he may have actually been taken to heaven as his disciples claim they witnessed. He may even have been a prophet sent from Heaven above!
So what? I still don't believe he is the Messiah.
They can find DNA evidence of him tomorrow. Maybe a space probe will get a photo of him flying past Pluto! He may appear before countless millions on live TV next week so that even atheists see he is real...and so what? Existing and being real is one thing. Being the full fledged Messiah of Jewish hopes, that's a whole other ball game, my friend.
I admire atheist logic and thought. Many of my fellow Jews are atheist, and some of these are my heroes, so I have no fight with the convictions of non-theists.
But it is easy to disbelieve in something you've dismissed as unreal compared to standing your ground in the face of a historical figure who is an imposter. What if G-d proves to be real tomorrow? If you are an atheist, why would a miracle from above matter? If empirical evidence of G-d is all you need to change your convictions, then how is that being an atheist? You're just a materialist. If a miracle like a talking dog or CNN broadcasting the return of Jesus will change your convictions, then you are are saying you will believe if you have proof. Correct me if I am wrong, that isn't necessarily someone who doesn't believe in G-d. That is just someone who is not convinced of G-d.
CNN can broadcast that "Promised Return of Jesus" with Anderson Cooper doing the interview asking: "Jesus, where you been." Sorry, evidence that Jesus is real and even that he is some type of actual deity still doesn't make him the Promised Jewish Messiah. So if you don't believe G-d is real, what does it matter if it turns out he is?