The blending doesn't always result in a formalized new religion. Syncretistic can also describe a society whose members identify themselves as all, some, and/or none of the various religions around (or a person who does same). Historically, many Chinese have been Buddhist and Taoist both--and in recent years there's been a bit of Christianity mixed in, even if it's just the form of a white wedding. The same is true in Japan, with Shinto in the place of Taoism.