Another reason people claim to have experienced miraculous things is that they want to draw attention to themselves.  Could that be motivating me here?

Again, highly unlikely.  I write about many things, and maintaining credibility is extremely important to me.  The kind of attention that talking about this is most likely to draw to me is negative:  “Oh, that kook who jabbers about some kind of wacko homespun religion he’s conjured up.”

I’ve kept quiet about this precisely because I’ve wanted to avoid the kind of attention it would most likely generate. (Assuming it results in any attention at all.)
 
What’s driven me to do it is a sense of obligation.
 
I may have had extremely good fortune in experiencing a number of rare, thought-provoking, and potentially eye-opening things.  If so, wouldn’t any responsible, conscientious person want to give others the benefit of them, too?  And wouldn’t the duty to share these be even more incumbent on someone who’s also been given the gift of pretty good communication skills?

On the other hand, maybe lots of people have had experiences similar to mine, but have kept these to themselves for the same reasons I haven’t written about my own until now—with the added impediment of not having strong enough communication skills to convey their stories in a credible and cogent way.  If this is the case, wouldn’t a conscientious person who’s been given these skills have an even greater obligation to give voice to what he’s experienced?
 
Another reason I’ve decided to go ahead and talk about such things is that as of this writing, I’m 75 years old, and just about to turn 76.  At this point, when my own mortality is more obvious to me, I tend to think of the classic advertising disclaimer, “This offer good for a limited time only!”  Although I’m still fit and in vigorous good health, there are no guarantees this won’t suddenly change.
 
I could also have my cognitive abilities slide into serious impairment at any time.  And on top of all this, like any other person, I could be hit by a bus while just crossing the street.