What if there was a religion, asks comedian Bill Maher, in which an all-powerful god from outer space decided to send his unborn son on a suicide mission to planet Earth? So this space-god impregnates a human female in some mystical, not-quite-physical fashion, and she gives birth to a baby who is both a human being and a divine incarnation, simultaneously the space god’s spawn and the space god himself. (Oh, space god also has a third manifestation, one that’s totally invisible.) So space-god junior is born on Earth destined to be killed, even though he’s a space god and therefore immortal. As you’ve picked up by now, the religion Maher is describing is not imaginary, and in various forms and guises is professed by most people in the United States, including every president we’ve ever had or are likely to have in the foreseeable future… In the acerbic late-night talk-show host’s new movie “Religulous,” made with “Borat” director Larry Charles, Maher keeps bludgeoning you with stories like these to make the point that the central story behind mainstream Christianity, when considered at face value and taken literally, sounds every bit as loony as the oft-derided tenets of Mormonism or Scientology.