You have to remember that religions are totally separate from the question of "Is there a GOD?"
Religions, all religions, are human constructs. Like all human constructs, they do evolve. But that does not address the question of whether or not there is a GOD.
If GOD exists, She exists regardless of any beliefs that It does not exist.
If GOD doesn't exist, It doesn't exist regardless of any beliefs that He does exist.
Aslan is not a
Tame Lion