You see, one sect of Christianity teaches one thing and other sect of Christianity teaches something different about the same subject, and yet both claim to teach the truth of the bible. How are we, as non-Christians, expected to believe either one when Christians seem unable to get the story and scripture straight without contradicting each other? It is most confusing, IMO.
It IS confusing, and I do not believe that God intended it this way. Our pride seems to be the greatest cause for the condition of Christianity at large.
If you (or anyone) really want to make sense of it (I certainly wanted to!) what has helped me was to begin to learn what the Apostles taught (as in how their disciples received it - the writings are preserved), and how their successors understood it, and so on. Eventually how change came, and why, and by who, and what changes. And how this change and that point of history caused this development, and so on and so on.
The problem is, it takes time. It has taken me a few years to get a handle I'm satisfied with. But it depends on how many topics you want to consider. Something like "original sin" (which the Orthodox didn't teach, btw) and how that came about and in turn affected other teachings through denominations could probably be explored pretty well in a few months.
But everyone says they have the right answer. That's pretty much built-in ... if they didn't think that, they wouldn't be in that church. So yes, it takes time to begin to understand and get an unbiased view (which I'm not saying I have perfectly - having made my decision, then seeing the fruit and benefits, I have given myself to it - but back to the OP's topic, our Church strongly encourages questions, and most Orthodox try to be charitable to others - that's a major part of our beliefs).
It can be unraveled, but it takes time and effort, especially since most people asking that question are going to have to do the work of searching it out themselves, as they probably won't be satisfied with anyone telling them what to believe.