Ooooh, and I thought I asked lots of questions!!!
Okay, to summarize, I look at the worldview ideas alone, first. I pass those ideas through my mental filter, and either agree, disagree, or just watch with interest. I don't see much of a point in following a worldview if you agree with its practitioners but disagree with its ideas -- it just doesn't make any sense to me.
I might then look at the practitioners, but "with a grain of salt", as I think it's only human that each one filters the primary worldview down through their own mentality and picks and chooses how to follow or apply it (regardless of what the priest or leader says). Religious practitioners are never clones, regardless of the group all following the same belief. Some practitioners of nearly every religion are likely to be inspiring people, just as other practitioners would steer you away entirely by their actions.
To some extent, I'll look at the originator and his/her way of life (if it's available -- for instance, who started the various religions of American Indian tribes or nations???).
Mostly, though, I either like the ideas within a worldview or I don't.
Gosh, you still have a lot of questions... um...
"Do you incorporate different views under one umbrella?"
To some extent, yes (the bits and pieces I like!). To put it one way, just because you're a Christian doesn't mean that you wouldn't maybe find some tenets of Taoism or Zen Buddhism to make some sense and be useful (and provide perspective on a matter that perhaps the Bible didn't address).
a) I don't assume that I know more than the originator -- I happen to have an open mind, that's all.
b) Hard to answer! Sorry.
Have I had a supernatural experience? Hmmmm... yes and no. Subtle ones, yes. Anything as concrete as voices or visions, no. More like feelings. I think like a lot of people it would be a heck of a lot simpler if God (or Goddess, or the Great Spirit, or whomever) would simply step out in front of me and say "here I am" or "do this", but I haven't had so concrete an experience. Instead we have the books and stories and collected writings of others who report having this happen to them -- but that's them (not little old me). Faith can exist just as well (if not better) in the presence of proof as it can in the absence of it.
Just as an aside, that's one thing that appealed to me about the David Eddings' series including The Belarion -- the gods in these stories would often manifest themselves within a heroic group, and were active and present and tangible in the world and even had a lovely sense of humor in certain cases.