Absence of evidence is not evidence of absence. I'll give you a scientific example, Superstring Theory is a prominent branch of physics that predicts the existence of magnetic monopoles. There is precisely zero evidence that such particles exist. Does that mean that they don't? Of course not. But by the standard used by atheists you have to state that they don't exist, because we have no evidence that they do. I feel bad for all those poor deluded physicists.