We know one thing for certain: our universe came into being. There are various theories as to how this occurred, and a deity is merely one theory. As it stands, the deity theory has absolutely no evidence. It's true that the possibility, however increasingly small, that this theory is the correct theory remains. However, at present, it lacks any supportive evidence.
People inclined to believe this theory, for whatever reasons and of whatever private motivations, do everything possible to obscure or evade the fact that there is no evidence. They attempt to redefine what constitutes evidence. They question ration. They resort to variations of the "we can't even know what we aren't just a brain in a jar" rhetoric. Yet the simple point remains: their preferred theory lacks evidence.