Christians like to believe that they are the heirs to the covenant, but they don’t like you confusing them with the original holders of the covenant. Thus they retain some Jewish practice, but they make sure to change it in certain ways, e.g.:
• they take one day off per week, but it’s Sunday, not Saturday.
• they use the Psalms in worship, but will often Christianize them by adding the Gloria Patri at the end of each one.
• Easter, like Passover, is a moveable feast, but Christians have arranged things so that Easter is never on the same day as Passover.
• something that until recently escaped my notice: a detail from the seal of Dartmouth College:
The Hebrew reads “El Shaddai” and means “God Almighty,” but note what it’s on – a triangle, obviously referring to the Holy Trinity. It’s as though to say, “Look at us, we know Hebrew! But please don’t confuse us with actual Hebrews.”
If you’re interested, more information on the Dartmouth seal may be found in “Notes from the Special Collections: The Dartmouth College Seal,” which appeared in the April 1997 number of the Dartmouth College Library Bulletin. I’m still proud of my first real article but I would like to note that Sir William Johnson, 1st Baronet, was not an Anglican priest, the mangled Hebrew in figure 1 does not look like “Arabic” (or any script at all really), and the seal of the Society for the Propagation of the Gospel in Foreign Parts, on which the Dartmouth seal is based, looks like this (this image was not included in the original article):

Wikipedia.