[Alan]

Freud's theories aren't quackery. Of course he had his quirks, like the cocaine thing, but those shouldn't really be the theories one ought to think when Freud is mention. It would be like remembering Einstein for his opposition to quantum mechanics. The id, ego and superego, the death drive, the oedipus complex, the seeds of discoveries of libido and Eros, civilization as repression...
All of these things are extremely important and completely groundbraking, and certainly not quackery. Even the harshest criticisms to the Oedipus complex, like Deleuze (I assume you know how much of a nerd I am for him) who named two of his books "Anti-Oedipus", still cannot deny that the complex is real, merely whether it is fundamental, and such statements are much more developed in Lacanian psychology.
Like Erich Fromm said, outside of Marx and Einstein, Freud is the most important architect of the modern era.

But anyway, that's psychology. Back to religion.