Bertrand Russell said this quote

I am sometimes shocked by the blasphemies of those who think themselves pious--for instance, the nuns who never take a bath without wearing a bathrobe all the time. When asked why, since no man can see them, they reply: Oh, but you forget the good God. Apparently they conceive of the Deity add a Peeping Tom, whose omnipotence enables Him to see through bathroom walls, but who is foiled by bathrobes.