How so?

There is not a single scrap of evidence or proof that God exists or has existed. There is supposition, yes. There is rumour. There is heresay and myth and there are stories.

But there is absolutely no proof or evidence. After thousands of years not one person has managed to bring anything to the table that might suggest even for a second that God exists, or at least did in the past. Logic would dictate that this means he does not exist. A rational person would agree with this.