R.C. Sproul comments in his book If There Is a God, Why Are There Atheists?:
“The New Testament maintains that unbelief is generated not so much by intellectual causes as by moral and psychological ones. The problem is not that there is insufficient evidence to convince rational beings that there is a God, but that rational beings have a natural antipathy to the being of God. In a word, the nature of God (at least the Christian God) is repugnant to man and is not the focus of desire or wish-projection” [as Sigmund Freud suggested].
Why is the idea of God repugnant to so many people? Sproul continues:
“God’s presence is severely threatening to man. God manifests a threat to man’s moral standards, a threat to his quest for autonomy, and a threat to his desire for concealment. God’s revelation involves the intrusion and indeed invasion of the ‘other,’ the ‘different,’ the alien and strange to human circumstances. In a word, it represents the invasion of light into the darkness to which man is accustomed.”
Best-selling psychologist/author M. Scott Peck writes in his book The Road Less Travelled:
“[A] reason that scientists are so prone to throw the baby out with the bath water is that science itself, as I have suggested, is a religion. The neophyte scientist, recently come or converted to the world view of science, can be every bit as fanatical as a Christian crusader or a soldier of Allah. This is particularly the case when we have come to science from a culture and home in which belief in God is firmly associated with ignorance, superstition, rigidity and hypocrisy. Then we have emotional as well as intellectual motives to smash the idols of primitive faith. A mark of maturity in scientists, however, is their awareness that science may be as subject to dogmatism as any other religion.”
“Another major reason that scientists are prone to throw out the baby with the bath water is that they do not see the baby. Many scientists simply do not look at the evidence of the reality of God. They suffer from a kind of tunnel vision, a psychologically self-imposed set of blinders which prevents them from turning their attention to the realm of the spirit.”
Source: [Excerpt] If the evidence for God is so strong, why are so many smart people unconvinced?, Scott Youngren. 2010