First of all, (but a number) I am only answer your absurd claims in order that if any with commonsense read your people's answers can get further understanding from mine . Mine are guided by the Holy Spirit, because they are put upon my heart, biblical quote and all. That is why I answer so concisely . "The offering of the first fruits' I bring this up because as Christ said not one jot or letter of the law will go unfilled.
The sacrifice on the altar:
Sharing in the Lord's Supper 1Corinthians 11:25-27
…25In the same way, after supper He took the cup, saying, “This cup is the new covenant in My blood; do this, as often as you drink it, in remembrance of Me.” 26
(For as often as you eat this bread and drink this cup, you proclaim the Lord’s death until He comes.) 27Therefore, whoever eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of sinning against the body and blood of the Lord.…
Why upon the altar? It is called an offering of the first fruits, which was part of the law and was a practice of OC Hebrews. Christ is upholding the offering of first fruits . He is the first fruit.
The Order of Resurrection 1 Corinthians
19If our hope in Christ is for this life alone, we are to be pitied more than all men. 20
But Christ has indeed been raised from the dead, the firstfruits of those who have fallen asleep. 21For since death came through a man, the resurrection of the dead comes also through a man.…
Hence, why Orthodox and Catholics do present Him upon the altar (HE IS THE OFFERING OF THE FIRST FRUITS). They are proclaiming the Lord's death until he comes. Not only that HE IS THE ONLY THING THAT IS TO BE OFFERED BECAUSE HE IS THE FINAL SACRIFICE FOR ALL. The Word of the Lord. As I said ,the Catholics hold the Dogma of the faith Protestants do not, even with all their SOLA SCRIPTURA. The Orthodox do as well. You reject the Dogma , which is the the law laid down by the AUTHORITY -CHRIST. Yes both the Catholic and Orthodox have some FALSELY DEFINED TITLES AND DOCTRINES , but they do not reject the LETTER OF THE LAW OF CHRIST as you people do. They therefore, with all their error, will always be in a better position than you people.