My hypothesis

[I_am_not_mafia]

Religion is like a parasitic organism and its ideal environment is an ignorant society. It is dying in our information age.

Two or more religions can form a daughter religion and over time a religion will reproduce itself with variation in a population according to selective pressures (known scientific facts).

This model predicts that many religions should appear spontaneously in ancient history (no selective pressures) despite low population and that religion should go extinct in the near future despite high population.

So essentially, the population of evolution deniers is dwindling according to principles of evolution.

I've often referred to religion as a parasitic meme. I mean meme like Richard Dawkin's used it in the Selfish Gene.

The parasite influences the actions of a host to increase its chances of spreading to new hosts and in so doing costs the host precious resources.