I've had feelings that I describe as "enlightenment" when I had believed on one side of a matter and could not grasp the other side. Then, without understanding the path, I had all this knowledge on the other side, but could not teach/relate to others on the former side. These were not religious matters and the events were few. But I suspect that this happens "religiously" as well.

So I appreciate that as a non-believer (that I cannot claim I ever was an "unbeliever", but only having less understanding of where I stood) it is unfathomable to see a path or line of reasoning to get to the believing state. Also, from the believing state (of my belief anyway), I don't believe that one can lose his salvation (once saved), so it is again unfathomable to see a road back to the former state of unbelieving.

Many "ways of life" do talk about "enlightenment". Unfortunately, I didn't find this definition in the dictionary (so in a way, I'm making up my own terms), so the above is only how I describe the path or lack of it; and call it "enlightenment".

Christian belief is that "Faith comes by hearing...the word".