Not so fast my friend. The life and death of Christ is of little dispute. Just because the dates may be incorrect does not deligitimize their occurance. On the other hand (and back on the subject), Kwanzaa is totally made up from whole cloth to celebrate a culture and philosophy that never knew each other. Debate that.
Oh yes it is worthy of dispute. It is totally made up from whole cloth with threads from prior pagan mythology. Kwanzaa has as much legitimacy as Christmas.