Internet discussion boards were very very helpful for me in sorting out various positions of large swaths of christian denominationalism. In the years after my "born again" experience I had to personally visit sects, sit under their teachings, examine, fact check to scriptures. It was very tedious and time consuming. But with the dawn of electronic information sharing in the early 90's it was so much better to simply ask respective members what their official positions were. There were some great protestant believers at the site in question and likewise some very talented older (we can't talk about them here) orthodox posters. I found the contrasts to be exceptionally helpful, for my protestant roots, which generally formed from protests against religious corruptions of the prior mentioned. Surface views are for surface examiners. I prefer to get at the heart of the matters, ugly as they really are. It is one thing to sit, dumb and happy happy. It is quite another to know that you may be sitting with people who are not all that nice/kind in their beliefs toward other christians, which was at the heart of my quest. I never really understood, in depth, from the time I was a child, WHY various divisions existed in my own family over disputes and outright damnations of each others over catholic/protestant divisions. It really puzzled me as a child. My questions have been answered by electronic information sharing.
I've also had some completely enjoyable scriptural discourses with some very learned folk over a long period of time, coming to know some of these people, personally. I spent 2 years for example with one of the heads of Jews for Judaism discussing, quite politely, their official sights of O.T. scriptures. We looked at basically, everything therein. It was fun to hear how they hear things. (hint-strongly literal/external applications and understandings.) And of course I sit in an opposite seat that examines "internal" perspectives with heavy emphasis on allegory/parable/similitude understandings.
Also had the opportunity to again examine "fringe" elements, which I would never partake in via personally sitting under. Mormonism, Mysticism, various christian Messianics, Shepherds Chapel, WWCoG, CoC, JWs, etc. Mostly from the CARM site but some from cf.com
In short just a whole lotta fun if you enjoy the arena of theology engagements. What I found in the end was that I can agree with just about any believer wholeheartedly in the Nicene creed arena for example. There is a lot of commonality of agreement there. Which oddly, the NICEne creed accidentally points to.
Part of what may contribute to getting along is that I flat out refuse to condemn anyone who has called upon Jesus to save them for any reasons whatsoever. Even if their own doctrines demand they potentially eternally condemn themselves. It makes for interesting engagements, when trying to convince them that I can legitimately take such a STAND FOR THEM when they can't for themselves. Quite odd.