Years ago a teaching that Jesus didn't really die was being given some prominence, but at the time I wasn't having any of it and I'm still not having any of it. The Scriptures are profitable for doctrine, reproof, correction and instruction in righteousness, that the person of God may be thoroughly furnished unto all good works. (2 Timothy 3:16-17, ) so here are a few headings and reference verses that help us proclaim the death of Christ in the celebration of the Lord's Supper, or Communion as it is known.
1 Corinthians 11:26 For as often as you eat this bread, and drink this cup, you proclaim the Lord's death till he come.
1. The Death of Christ is Real: as planned by God (1 Peter 1:18-21, Revelation 13:8, ), as pictured and prophesied (Isaiah 53:8-9,), as our passover (1 Corinthians 5:7, ), as payment by God at His own expense, forgiving the debt ( Matthew 20:28, Acts 20:28, 1 Corinthians 6:20,)
2. The Death of Christ is Voluntary: as submitted to by Him (John 10:17-18, Luke 22:42, Philippians 2:6-8, )
3. The Death of Christ is Sufficient: to deliver, reconcile, cleanse, and fill sinners with hope (John 19:30, Colossians 2:8-10, )
4. The Death of Christ is Dynamic: because it leads to the death of death's curse, power, and dominion (Isaiah 25:8, Acts 2:22-24, 1 Corinthians 15: 54-57, Colossians 2:11-15, Hebrews 2:14-15, Revelation 1:17-18, 20:14, 21:14, )
If the death of Christ is not a real death then no real payment for sin has been made, and the types and shadows of Old Testament sacrifices have not been fulfilled.
If the death of Christ is not voluntary then it is not an obedient act of love.
If the death of Christ is not sufficient then there is more work to be done.
If the death of Christ is not dynamic then him who has the power of death is not destroyed, that is - the devil, and death is not swallowed up in victory.
Better to proclaim all these aspects of Christ's death than deny them...
I hope some find this material helpful.