Well December 25th was taked directly from the worship of Mithras, an old zorastrian God.
In fact a lot of Christian Ritual may have been taken from the worship of Mithras, given that he predated the Christ Figure by 500 years or more.
http://www.taivaansusi.net/historia/mithraism.html
Maybe you are all actually Mithras worshippers and just don't know it? Names change . . .