This isn't a community, or social group, its religion. And I think you're wrong about the whole gay thing but that's speculation so whatever, it's not the matter I want to address in your synopsis.
So, while I'm not sure you're an atheist or religious, I will say that the modern Atheist outlook on religion is that they are just social groups, and twisted stories to help a group of individuals survive and become the fittest, (Darwin's evolution theory being used on why religion would be useful to a species.)
However, I find it very interesting how he came to the conclusion he did, instead of turning outwards and seeking others to guide him away from the LDS. He turned to the spiritual, and while many Atheists would claim he sought the answer in himself, or his subconscious had simply had enough. An argument can be made that God delivered him away from the lies and to the truth, not all at once, but through dedication and time, then giving him a final revelation at how far he's come to show him what God has been working towards. Both are arguably speculation, and neither can be proven in corporeal terms.
Religion is not a social group but rather, a means to define that which we cannot see or understand. Who are you? are you some dirt that gets a brief existence, only to return to dirt and feed the trees? What created us? were we an accident or planned and molded into existence? Religion is designed to ask these questions of us, and provide answers where it can. Whether you believe these answers are divinely given is the act of being religious, its not about the group, its about the questions and how you get there. If you believe because of the group, then you truly do not believe at all.
And then finally, " I wonder if he has any understanding that while he believes he has entered a larger world all he has done is left his family and people behind in order to die alone without their love." These are your words, and the come from naivety. You have no idea what it is like for the people who are supposed to "love you" to manipulate, threaten, and abuse you. And it is better to cut those kind of people off than continue in their presence. I've been there, my close family has as well, and we are MUCH better off now than ever.
This world is beautiful, yet also very grim and dark, to deny such is a fruitless endeavor. Through this you can understand how a situation can arise where one must abandon seemingly everything to come out on the other side.
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