Drummond, you gotta hit the books before you cite stuff, or you're just gonna insert foot again. The Seder has been around for only abour 2500 to 3000 years, and even then, its form has changed quite a bit over the insuing time. There are holiday celebrations and traditions far older then that. Some portions of Chinese culture date back to 5000 years back into recorded history or better, and their calendar with all the holidays is no exception. Egyptian customs also had a lot of time clocked before the Seder came about. Now about the Passover itself, it has a large influence in both Jewish and Christian circles. Firstly, the Seder comemorates the ancient Exodus of Israel from Egypt. Secondly, some Jewish families also use the Passover meal as one time of the year to remember the Holocaust. Thirdly, the Seder was when Jesus instituted the sacrement of Holy Communion, a founding tenet of Christian theology. I would celebrate the Seder in a heartbeat were someone to invite me, just because it is part of my heritage as a Christian, since Christianity sprang forth from Judaism.