I have had to swallow some bitter pills in delving into the past of christianity. While christianity might not have become the major religion it is now, at least it would have had a honest past if these gentlemen had not corrupted so much of it. Yes Constantine and his cohorts were all p....s.
And yes the same goes for christmas as well, it is a blatant usurpation of pagan themes and rituals. And in usurping these rituals, christians have lost most of their roots to falsehood. For those of us who actually go to the trouble of analysing the bible, we can come up with solid dates for the events of Jesus life without doing any inventing, it is all there, and in so doing, the bible suddenly moves from the realm of myth, to that of history.