I found this comment out on the bloggernacle from someone named Christopher Smith:
Most people don’t want to believe less. They want to believe more. People who do make the decision to believe less tend to be skeptical types, and not infrequently end up at the bottom of the slippery slope. This is why Whitmerites and RLDS end up as Protestants, and liberal Protestants end up as atheists, whereas fundamentalists and messianic sects continue to thrive and multiply.