Why do Athiests require 'proof' that God exists?

[Welsh cake]

What does the color nine smell like?

I wouldn't know. Guess we're both smart enough not to do drugs eh?

I could claim that the universe was made by Aliens trying to brew beer in their basement, in your strain of thought.

Frightfully easy to make claims isn't it?

I'll trump that. I claim the universe is nothing more than a 3D hologram created by 2D information stored at the edge of the universe, its a projection of a simulation from a quantum computer created by minds immeasurably superior to ours, and that the reason we exist is because these gigantic aliens who created it simply forgot to turn it off when all the useful meaningful information was already gathered. Its not only that we don't matter, its just that we're not, real. How's that for an existential nightmare?

Sucks to be us.