There are so many things in your O.P that are either plain wrong, or not explained with sufficient nuance.
Of course, every sane and realistic person should question what they believe, or you continue on through life believing lies and nonsense. If what you believe is Truth, it will withstand ANY scrutiny ! Truth is only established upon irrefutable facts and Evidence.
Once a person becomes a non-believer, in religious nonsense, including gods, it is not a problem, as you describe, " living with the full mental and emotional consequences of being one is a lot harder than most understand ", except at first, very soon the relief of Freedom of Mind, being a Realist, and expunging baseless fears, is so immensely wonderful, that first feeling soon fades !
I was a full on Bible believing J.W for 58 years, from birth,only when I reached the stage outlined above, after a year or two from when I initially "woke up", did I experience True Happiness, for the first time in my life !