Why no Athena movement in the world today? If the ideas behind it were so powerful, people would be fighting for the freedom to worship as such. The better ideas come forward over time (idea evolution?). Take communistic atheism vs. Roman Catholicism. One's dying out, the other is the largest religion in the world, and is growing as a percentage of total global population.
Because of what general_re said in #846. (I couldn't've said it any better.)