i don't have much to add other than it's an excellent (but long) read, which should prompt plenty of discussion from anyone who reads it. it touches on many topics i think you'll enjoy, such as indoctrination, the history of religious beliefs, the effect of IQ and education on beliefs, and spirituality in general.
i particularly enjoyed his anecdote towards the end when he posited how people would recognize Jesus should he decide to come back to Earth. the whole thing is filled with juicy nuggets like that, so enjoy.
...IF those traits associated with religiosity COULD be wiped out overnight, what might be the result?
You're right about our intuitive and autonomic responses playing larger roles than reason.
The early Soviet Union wiped out more than the traits associated with religiosity, it wiped out religion. After ~65 years of official atheism, the Soviet Union broke up and religion/religiosity returned.