David Creech and Jared Calaway have good points about practice - and polypraxy should be part of this new language.
Although some say that it is technically correct that the "doxys" are "belief" or "doctrine" oriented, the words are actually used in the literature to encompass the entire "lived" tradition being discussed, not just the doctrines but also what the doctrines mean in terms of practice. So I think that that polydoxy can be more inclusive, referencing not only what different Christians were saying theologically but what the implications of that theology was for their ritual behaviors and lifestyles.
I guess what I'm saying is that a religious tradition doesn't make a strict distinction between thinking and doing - they are intertwined. This distinction appears to be a western scholastic distinction. In fact, if you study eastern orthodoxy at all you will be immediately faced with the fact that "orthodoxy" is "a way of life" based on certain beliefs. Orthodoxy is defined by the tradition as "right belief" and "right glory" or "right worship." The Orthodox church today thinks that it is orthodox because it teaches true belief and right worship.
This understanding of the eastern Orthodox appears to me to be quite old. When the ancient Christians were concerned about "orthodoxy" they were concerned about correct doctrine because it led to correct practice (and thus salvation). That is what the fourth and fifth century Christological dispute was all about. It wasn't about whether or not Jesus had his own soul. It was about the eucharist - making sure that the body that was being eaten gave the faithful the right benefit. The argument that "won" was a compromise argument between the West and the Antiocheans, and it was the argument that Jesus had to have his own soul, because he has to be fully human in order for his bodily sacrifice to be vicarious for us when it is eaten at the altar.