[Campion]

The word “Mass” in Christmas means death and the ritual of the Mass involves the death of Christ, and his consequent resurrection.

The word "Mass" has nothing whatsoever to do with death. It's the Anglicization of the the Latin "Missa". "Missa" comes from the priest's words at the end of the liturgy, "Ite, missa est", probably best translated as "Go, you are dismissed". "Missa" certainly derives from the Latin verb "motto, matters", meaning "to send". No death anywhere in sight.

[Campion]

Sorry, should be “derived from the Latin verb “mitto, mittere” ... stupid tablet auto-correct!