Religion evolves. At one point in history goddess worship was what held people in its sway. That evolved into polytheism, which evolved into monotheism. Religion evolves to better fit the needs of the people at any given time, which is why I doubt it will ever truly fade away. The three Judeo-Christian religions will fade into mythology, certainly, but religion itself will always evolve and remain. Unfortunately.
"Never trust a fox. Looks like a dog, behaves like a cat."
~ Erin Hunter
~ Erin Hunter