hmm...

What if God were not exactly truth, and if this could be proved? And if he were instead the vanity, the desire for power, the ambitions, the fear, and the enraptured and terrified folly of mankind? (Nietzsche)

My point is that from the fact that someone is convinced that something is true, however firm his conviction may be, it never follows logically that it is true. .. Except in the rare cases where the truth of the statement in question is a logical condition of its being believed, as in the assertion of one's own existence. (Ayer)