Oubliette that's what you get for posting a humdinger on a Sunday!! You need a no brainer 2 word answer question on Sunday!
I fully agree that one of the biggest blocks to mankinds'progress is religon.
Getting back to your op, the shining light at the end of my religous (tunnel)thinking was a short course on the philosophy of David Hume (as I'm a Hume), which lead me to review the enlightenment thinkers in general. Further to that I undertook some undergraduate courses in philosophy & law.
I think the final nail in the coffin for me was the question of the Witnesses much vaunted freewill (it's a gift you know!!)
and determinism. I fingured that in believing in an all knowing god, the witnesses did indeed believe in pre destination (an extreme form of determinism) and of course in human inherited sin (extreme personal responsibility). This would make the JW no benevelent god at all, in holding us accountable if the outcome of the choices we where forced to make did not please him.
But yes, reason is the lamp (to)which I hold, I "saught an honest (hearted)man," (when a JW)
Then, I held up my lamp to "seek god". I realized the philosophers "had killed god!!".
And I was kinda glad.
Sister Diogenes