You have not studied to show yourself approved.

Lutero:
Matt 18: 15 “If your brother sins, go and show him his fault in private; if he listens to you, you have won your brother. 16 “But if he does not listen to you, take one or two more with you, so that BY THE MOUTH OF TWO OR THREE WITNESSES EVERY FACT MAY BE CONFIRMED. 17 “If he refuses to listen to them, tell it to the church; and if he refuses to listen even to the church, let him be to you as a Gentile and a tax collector. 18 “Truly I say to you, whatever you bind on earth shall have been bound in heaven; and whatever you loose on earth shall have been loosed in heaven.


Jesus speaking to all the disciples says the above.

So, if all the disciples had the ability to bind and loose, then binding and loosing cannot be the "keys' that were specially given to Peter.

Obviously, you have not studied to show yourself approved.

Eliakim was the Prime Minister. Prime meaning the Chief of the ministers. He was given the keys to the entire Kingdom. 

St. Peter is Christ's Prime Minister. He is given the keys to bind and loose the entire Kingdom.

Eliakim, being the Chief, also had ministers under him. Each one with their own jurisdiction and with the power to bind and loose therein. 

St. Peter also, being the Prince of the Apostles, has the right to bind and loose in the entire Kingdom. But the Apostles had the right to bind and loose as well, in their own jurisdiction.

Peter received the marvelous blessing of opening the door to the kingdom of heaven to the Jews on the day of Pentecost and of opening the door to the kingdom of heaven to the Gentiles when he preached to Gospel to Cornelius. THAT reveals the keys Peter was given.

In other words, the keys to the whole world. Because the world is divided into Jew and Gentile. Those who are Jews and those who are not.

The apostles, as part of the foundation of the church, were specially equipped to declare what would be binding and what would not upon the church. And we see that occurring, for example, when circumcision was declared non-binding upon the Gentiles, while the refraining from blood was declared binding.

By the entire Council in union with the then Pope, Peter.

Which, of course is an additional rebuttal of the RC claims that Christians are to consume Jesus' blood. By the time this affirmation was issued that Christians were to NOT consume blood, several years had passed since the first Lord's Supper. Yet the apostles set forth no exemption that consumption of blood was forbidden EXCEPT for the Lord's Supper.

What does Scripture say?

1 Corinthians 10:16

King James Version (KJV)
¹⁶ The cup of blessing which we bless, is it not the communion of the blood of Christ? The bread which we break, is it not the communion of the body of Christ?

1 Corinthians 11:24-27

King James Version (KJV)
²⁴ And when he had given thanks, he brake it, and said, Take, eat: this is my body, which is broken for you: this do in remembrance of me.
²⁵ After the same manner also he took the cup, when he had supped, saying, this cup is the new testament in my blood: this do ye, as oft as ye drink it, in remembrance of me.
²⁶ For as often as ye eat this bread, and drink this cup, ye do shew the Lord's death till he come.
²⁷ Wherefore whosoever shall eat this bread, and drink this cup of the Lord, unworthily, shall be guilty of the body and blood of the Lord.
Yeah, Scripture is clear. The Cup of blessing is the Blood of Christ:
Hebrews 10:25-31

King James Version (KJV)
²⁵ Not forsaking the assembling of ourselves together, as the manner of some is; but exhorting one another: and so much the more, as ye see the day approaching.
²⁶ For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins,
²⁷ But a certain fearful looking for of judgment and fiery indignation, which shall devour the adversaries.
²⁸ He that despised Moses' law died without mercy under two or three witnesses:
²⁹ Of how much sorer punishment, suppose ye, shall he be thought worthy, who hath trodden under foot the Son of God, and hath counted the blood of the covenant, wherewith he was sanctified, an unholy thing, and hath done despite unto the Spirit of grace?
³⁰ For we know him that hath said, Vengeance belongeth unto me, I will recompense, saith the Lord. And again, The Lord shall judge his people.
³¹ It is a fearful thing to fall into the hands of the living God.

Yeah, anyone who despises Communion, treats the blood of Christ as an unholy thing.

Sincerely,

De Maria