Final answer:
The sacrament being referred to in the question is the Eucharist. Through the Eucharist, Christians are united with Christ and his act of praise and thanksgiving offered on the cross.
Step-by-step explanation:
The sacrament being referred to in the question is the Eucharist. Through the Eucharist, Christians are united with Christ and his act of praise and thanksgiving offered on the cross. The Eucharist is a Christian practice where believers eat bread and drink wine to remember Christ's sacrifice for the sins of humanity.
Catholics and Eastern Orthodox believe in the doctrine of transubstantiation, where the bread and wine actually transform into the body and blood of Christ. On the other hand, Protestants and other Christians see the Eucharist as a symbolic reminder and re-enactment of Christ's sacrifice.