Well there is no doubt that the traditions of different old beliefs ended up wrapped up together. But I don't believe it was ever a planned "conspiracy". Likely as some people turned one direction, some kept the old traditions and they ended up being mixed over time. Plus, don't forget about commercialization. Retailers love kids expecting gifts from "Santa" as well as from parents.Father Christmas/Santa Claus/Saint Nicholas is an amalgamation of several religious myths and traditions into one, as is Christmas itself. It is easier to convert nonbelievers if you roll up their holidays into your own.