brought to you by "O Come, Let Us Adore Him"
For some reason, up in these parts, many parishes still have a tendency of using O come, let us adore him / Venite, Adoremus as a memorial acclamation. Now, I must say that the ditty in question is, well, not really a ditty, but the refrain of a beautifully-written Christmas carol. However, it is NOT a memorial acclamation.
Let us proclaim the mystery of faith.
The "mystery of faith", mysterium fidei, is not the Lord's birth, though we are in the season to celebrate such. The mystery of faith is what we recall every time we come to Mass - the Eucharist, our Lord's Holy Sacrifice of His Body and Blood, his passion, death, and resurrection.
- Dying you destroyed our death, rising you restored our life; Lord Jesus, come in glory.
- When we eat this bread and drink this cup, we proclaim your death, Lord Jesus, until you come in glory.
- Lord, by your cross and resurrection, you have set us free; you are the Savior of the world.
(and I guess the add-on, Christ has died, Christ is risen, Christ will come again.)
Don't get me wrong - I love the hymn Adeste Fideles, but in its rightful place.