God exists, even if only as a manifestation of oneself, concerning the delusion of reality. That is, suppose for a moment that I do not really exist and you don't either. Some entity is trying to fool us into existence. However, on some level, in order for this lie to actually work, it involves a deceiver (which we can call God), and a deceived (at least me, this theory can't for certain prove beyond
sollipsis). Even if we suppose that God too is a delusion, and that only I am sure to exist, this means that in fact God exists, as a delusion within one's own mind, that is, God is part of you. Hell, even if we really and truly exist, that implies a Creator, whether it be me, you, space aliens, some ancient being, the Earth itself, the law of genetics, cosmic force like the Tao, random chance, or whatever. Whatever you claim is the Origin, since it can structure Existence, is also the definition of a God.
Also,
you should read this.
All of which means, oddly enough, that if you are an atheist, you have to figure out whether you're the only sane person for not believing the delusion, or you're mad for seeing something nobody else sees.