It's a complicated set of questions you're asking, but I'll do my best to reply succinctly.
Yes, there is a whole lot of poor epistemology in the world at large. Many people never take the time to question why they believe what they believe; they were planted in some tradition at birth and they follow it their whole lives.
From some of the articles you've written in the past, I think I can guess where you're going with this -- is it fair to assume you're a Christian who feels Christianity is the most solid/logical worldview, based on real evidence?
I think truth is truth no matter what people think about it. Microbes always caused illness, long before people knew they existed. The universe was always vast, long before people realized the stars in the sky were objects like our own sun, or that there were galaxies outside the Milky Way.
So, in a sense... sure. It's theoretically possible that some religions contain more objective truth than others, even if they seem ridiculous to atheists or have crazy cultish adherents. But I still think supernatural claims have quite an uphill battle to be accepted as objective, verifiable truth. You can analyze history through different lenses to make various extrapolations about religious texts and conclude that one religion's claims about the spiritual realm are correct (as members of all world religions surely do)... but I find that this process is too susceptible to bias. I'm still waiting to see one video of God spontaneously restoring an amputated limb. That would change my mind in a hurry.
To me, the fact that intelligent, rational people can look at all the same evidence and come to mutually exclusive conclusions only points to agnosticism being correct. We can become convinced of the truth of things but we can never 100% know that we know for sure.
As for your last question, I don't think I can say what is or isn't fruitful for those leaving religion in dire circumstances. Sometimes it might be helpful for them to look at other religions. Other times they might do better to focus on grounding themselves in empirical truth that isn't tied to supernatural belief, at least for a time. I think it comes down to their personality and circumstances.
