Surely, one of the familiar proof of the existence of Christian God is the Watchmaker's argument, namely when we look at the surrounding then any layperson should realize it must be a product of divine intelligence.
Evidently it has skipped one step:
Since human being is a biological entity, therefore we would infer with anthropocentric basis. We would identify 'evidence of God's work' using same criteria as we identify the product of human labor, which subtly equating human with Christian God(since both are active in shaping the environment.) Just like when we look out from our eye and forgot the eyesight of us is bounded by the structure and mechanism of the components of the eye; the proponent of this line of argument has forgotten we are thinking with a built-in bias: Our own existence. We are thinking from the structures of our brain using mechanisms of our mind. Much like eyelid bound our eyesight but we tend to think what we see is the whole world without boundary, when we are thinking we assume that our thinking is as unbounded as our eyesight. We naturally and easily forgot there is a framework which our thinking take place. The realization of this boundary and framework of our thinking, i.e. when we are thinking we know it is 'we as human being' are thinking. So we are more than ready to attribute any human characteristic to the natural world, much like we characterize storm with human emotion like angry, furor, rages.
I believe the realization of the boundary of one's thought is an remarkable intellectual achievement. I think it could be use as a reliable measurement of intelligence, and as a sign of intellectual maturity. What I am arriving at is a politically incorrect notion that Atheist are more intelligent than religious.