A Christian Seder? Really!?

Recently we were invited to partake in a "Christian" Seder. For those who don't know a Seder is a Jewish Passover celebration. It is the Old Testament Passover that they are celebrating where the Israelites were spared the wrath of God upon the Egyptians and liberated from Egypt. My question is how do you Christianize this when Jesus Christ is our Passover? Should you even try? There seems to be a huge movement within Christianity to Judaize Christianity. I simply don't see how mixing the two is possible since one denies the very essence of the other. It seems to me that by Judaizing Christianity is to deny all that Christ taught us and all that he sacrificed for. In the Old Testament we see a huge list of do's and don'ts (Leviticus and Deuteronomy. Apparently it was impossible to achieve salvation by following these numerous laws. Therefore enters Salvation by Grace...Jesus Christ. Salvation comes by the grace and sacrifice of our Lord and Saviour Jesus Christ, not by following an immense set of rules. We failed at following the rules and we still fail at following the rules. Christ said in Mathew 9:17 Neither do men put new wine into old bottles: else the bottles break, and the wine runneth out, and the bottles perish: but they put new wine into new bottles, and both are preserved. And so to me putting the new wine of Christianity into the old bottles of Judaism will lead to destruction of the vessel (person). As of late, Christianity seems to be infatuated with all things Jewish. Maybe they need to take a step back and become infatuated with Jesus Christ instead. A Christian Seder? Really?! What an insult to Christ's sacrifice for us! Blessings, Kat