William Dembski a leading Intelligent Design advocate made the following statement in his 1999 Intelligent Design: The Bridge Between Science & Theology:
[Scientific naturalism is not] to deny God. But it is to affirm that if God exists, he was marvelously adept at covering his tracks and giving no evidence that he ever interacted with the world. To be sure, there is no logical contradiction for the scientific naturalist to affirm God's existence. But this can be done only by making God a superfluous rider on top of a self-contained account of the world (p. 104).
Scientific naturalism is the unifying methodology of science. Dembski considers scientific naturalism to be a spiritual sickness and idolatry, and the above quote is an example of his critiques theistic evolution. For me, the salience of Dembski's statement is not in its application to theistic evolution but rather in what it suggests about evolution itself.
Dembski faults naturalistic evolution for the manner in which it veils God, making God out to be a "superfluous rider on top of a self-contained … world." Though evolution does not necessarily disprove the existence of God or gods, it does make the supernatural unnecessary. In the light of evolution, God becomes an unnecessary side to naturalistic processes. Dembski maintains that it is possible to maintain belief in God while believing in evolution, but such a belief is lacking in parsimony (p. 114).
What is the relationship between atheism and evolution? Why are some theists able to accept evolution and retain belief in God or the supernatural?