why does the bible say in 1Cor;11;26 that while we use the Lords supper, we proclaim him to be dead?

Answer 1

The Lord's supper is the eternal fulfillment of the Jewish Passover, and the definitive new covenant sacrifice for sin, which carries out Christ's great work of redemption then, now, and forever.

When we proclaim the fact that he died for us in this way, we remember him, just as he requested.

Furthermore, we remind God the Father that Jesus willingly died for us because he loves us. In this way, we might avoid suffering some of the consequences of our sins, due to Christ's merit ... not by ours.

Declaring our faith in Christ in this way, we share in his perfect and atoning sacrifice, and we participate in true, practical worship.

Christ has died. Christ is risen. Christ will come again.

Answer 2

"For as often as you eat this bread and drink this cup, you proclaim the Lord's death till He comes."

By taking part in Communion you are signifying that you are taking (symbolically, not literally) Christ's sacrifice, (i.e., His death) by eating His body and drinking His blood.
The Lord's death on the cross is an integral and pivotal part of Christianity, without we would have no one to pay our sin debt on the cross.
"Proclaiming His death" simply means that you acknowledge His sacrifice on your behalf.

Answer 3

This is something the catholics like to practice every time they are in mass. Jesus died once and he rose again. We don't need to keep reminding Him.