It's impossible to prove we're real, let alone a god. Everything about us defies all sensible reasoning unless we alter our understanding to fantasy and reason from a fictious world where one can make sense of themselves. If we don't, we're confronted by the void that begets our whole and inundated by paradoxes.
Do you understand? Truth is of fiction, sense from nonsense, real from unreal because before us all is a story we project to experience, along with the character we know as I, and the moment we attempt to look beyond that, we cease altogether.