Yes, it does take time, but what I’m asking about is not how much time it takes, but why the milieu changes in the first place; why some ages are more predisposed than others to believe in God. I realize that this is a big question, the answer to which probably requires a good deal more philosophical and historical than scientific reflection, but it’s this sort of thing we have to understand if we want to understand why the scientists of our era think the way they do.
You’ve given several examples, which did, I think, as a matter of historical fact, contribute in some ways to modern unbelief, but still, they aren’t really satisfying. Darwin’s early supporters numbered many Anglican clergymen who thought that is was just as good, or better, for God to work through a natural process like evolution as opposed to a series of discrete miraculous acts; for them, belief in evolution did not require disbelief in God. As for urea, vitalism, and so on, they were never really requirements of belief in God in the first place; there is nothing about belief in God that entails the view that certain molecules could only be made by God, not by man or nature. God might manufacture molecules needed for life through chemical evolutionary processes. And sure, quantum mechanics does not fit easily with some notions of Newtonian physics, but is it inconceivable that God could create a world in which quantum phenomena operated? Indeed, many evolutionists (e.g., Robert Russell) have suggested that God might control evolution invisibly, hidden under quantum indeterminism. The God of theism is not necessarily tied to Aristotelian or other Medieval concepts, or to particular concepts of Newton, Boyle, etc. I don’t see how modern science should lead one to reject God – though it might well lead one to reject a concept of God that is too tied to either a literal reading of Genesis or to earlier scientific concepts of nature and causality that are no longer held by scientists.
If the question on the survey was, “Do you believe in a traditional conception of God?” the negative answers might make more sense, but since it’s just “God” without qualification, why wouldn’t a scientist select “Don’t Know / Not Sure” rather than “I don’t believe in God”?
Your suggestions all make sense to me, so I’m not rejecting them outright, but trying to convey to you where I’m still puzzled. David Heddle’s put out his original question with more or less an invitation for us all to think out loud, so that’s what I’m doing.