Neurophilosopher, Thomas Metzinger says in his Book:
THE EGO TUNNEL: THESCIENCE OF THE MIND AND THE MYTH OF THE SELF
The Ego evolved as an instrument in social cognition, and one of its greatest functional advantages was that it allowed us to read the minds of other animals or conspecifics — and then to deceive them. Or deceive ourselves. Since our inbuilt existential need for full emotional and physical security can never be fulfilled, we have a strong drive toward delusion and bizarre belief systems. Psychological evolution endowed us with the irresistible urge to satisfy our emotional need for stability and emotional meaningfulness by creating metaphysical worlds and invisible persons. Whereas spirituality might be defined as seeing what is — as letting go of the search for emotional security — religious faith can be seen as an attempt to cling to that search by redesigning the Ego Tunnel. Religious belief is an attempt to endow your life with deeper meaning and embed it in a positive metacontext — it is the deeply human attempt to finally feel at home. It is a strategy to outsmart the hedonic treadmill. On an individual level, it seems to be one of the most successful ways to achieve a stable state — as good as or better than any drug so far discovered. Now science seems to be taking all this away from us. The emerging emptiness may be one reason for the current rise of religious fundamentalism, even in secular societies.
This quote helped me realize why JWs reject evolution so strongly. The stronger the evidence for it, the deeper they reject it. If religious belief in general is this strong, JW beliefs are on steroids.