Passover is not an antiquated ritual that needs to go by the wayside. It has great meaning in the lives of, not only the Jews, but Christians as well. You may ask "What is Passover?" I'm glad you asked because THAT is exactly what God wants us to ask.
If we turn our Bibles back to Exodus and read about that first Passover, we learn that God instructed Moses and the people to celebrate The Passover every year. God said that the children would ask, "What is Passover? Why do we do this?" And then they would have the opportunity to share how God saved them from the death angel that visited Egypt killing all the first born. BUT he "passed over" and did NOT kill those (the Israelites) who had the blood of a spotless lamb on their door posts.
Exodus 12:26-27 (NIV)
(26) And when your children ask you, 'What does this ceremony mean to you?'
(27) then tell them, 'It is the Passover sacrifice to the LORD , who passed over the houses of the Israelites in Egypt and spared our homes when he struck down the Egyptians.'" Then the people bowed down and worshiped.
Celebrating Passover preserves the heritage of the Jews. It keeps them from forgetting what God has done for them through all the ages. "But what does that have to do with us, as Christians?" you may ask. Oh, I am so glad you asked!