An argument from undesign

Continuing to sample the child abuses of religion, I share another excerpt from Christopher Hitchens's God Is Not Great (which book I of course highly recommend that you read in its entirety):

As to immoral practice, it is hard to imagine anything more grotesque than the mutilation of infant genitalia. Nor is it easy to imagine anything more incompatible with the argument from design. We must assume that a designer god would pay especial attention to the reproductive organs of his creatures, which are so essential for the continuation of the species [emphasis mine]. But religious ritual since the dawn of time has insisted on snatching children from the cradle and taking sharp stones or knives to their pudenda. In some animist and Muslim societies, it is the female babies who suffer the worst, with the excision of the labia and the clitoris. This practice is sometimes postponed to adolescence and, as earlier described, accompanied by infibulation, or the sewing up on the vagina with only a small aperture for the passage of blood and urine. The aim is clear—to kill or dull the girl's sexual instinct and destroy the temptation to experiment with any man save the one to whom she will be given (and who will have the privilege of rending those threads on the dreaded nuptial night). Meanwhile, she will be taught that her monthly visitation of blood is a curse (all religions have expressed a horror of it, and many still prohibit menstruating women from attending service) and that she is an unclean vessel.
      In other cultures, notably the "Judeo-Christian," it is the sexual mutilation of small boys that is insisted upon. (For some reason, little girls can be Jewish without genital alteration: it is useless to look for consistency in the covenants that people believe they have made with god.) Here, the original motives appear to be twofold. The shedding of blood—which is insisted upon at circumcision ceremonies—is most probably a symbolic survival from the animal and human sacrifices which were such a feature of the gore-soaked landscape of the Old Testament. By adhering to the practice, parents could offer to sacrifice a part of the child as a stand-in for the whole. Objections to interference with something that god must have designed with care—the human penis—were overcome by the invented dogma that Adam was born circumcised and in the image of god. Indeed, it is argued by some rabbis that Moses, too, was born circumcised, though this claim may result from the fact that his own circumcision is nowhere mentioned in the Pentateuch.
      The second purpose—very unambivalently stated by Maimonides—was the same as for girls: the destruction as far as possible of the pleasurable side of sexual intercourse.... [pp. 223-224]