How would you All interpret Matthew 16:19?

Jesus says that Peter can be happy that God revealed this to him, adding: "I say to you: You are Peter, and on this rock I will build my congregation, and the gates of the Grave will not overpower it." Jesus means that he himself will build a congregation and that even the Grave will not hold captive it's members if they maintain a faithful course on earth. He promises Peter: "I will give you the keys of the Kingdom of the heavens." Matthew 16: 18, 19.

Jesus does not give Peter first place among the apostles, nor does Jesus make him the foundation of the congregation. Jesus himself is the Rock upon which his congregation will be built. (1 Corinthians 3:11; Ephesians 2:20)

Peter, though, is to receive three keys. He will have the privilege of opening, as it where, the opportunity for groups of people to enter the Kingdom of the heavens.

Peter would use the first key at Pentecost 33 C.E., showing repentant Jews and proselytes what they must do to be saved. 

He would use the second to open to believing Samaritans the opportunity to enter God's Kingdom.

Then, in 36 C.E., Peter would use the third to extend that opportunity to uncircumcised gentiles, Cornelius and others.    Acts 2:37, 38; 8: 14-17; 10: 44-48.

Literally, applying to Peter, to all his future successors and to the Holy Catholic Church that Jesus personally founded.

Not interpret.  Apply.  It means what it says and it says what it means.  Jesus Christ gave Peter, James, and John certain keys or powers and authority to conduct the work of the church.  People assume their baptisms will be valid in heaven.  So why not marriages as well, if they are bound by the apostolic binding power?

Here is the way that verse reads in two versions:

"I will give you the keys of the kingdom of heaven; and whatever you bind (declare to be improper and unlawful) on earth must be what is already bound in heaven; and whatever you loose (declare lawful) on earth must be what is already loosed in heaven."  (Amplified Bible, Classic Edition, the parenthetical statements are included in that publication)

"I will give you the keys of the holy nation of heaven. Whatever you do not allow on earth will not have been allowed in heaven. Whatever you allow on earth will have been allowed in heaven.” (NIV)

Notice, the things Peter was to bind or loose, were those that were already allowed / restricted in heaven.

Jesus was NOT telling Peter that if he made a rule, then that rule would then be binding in heaven.

What he was being told is that he should teach the things that already have heavenly authority.

"Keys" open a lock or a door.

In Acts 2, we see the beginning of the church.  In Matthew 16:18, Jesus said "I will build (future tense) my church."  "Kingdom" in verse 19 is used interchangeably with the word "church".  (The church is the kingdom.)

But in Acts 2, we see the church is in existence and the saved people were being "added to" it . (Acts 2:47)

Peter preached the sermon in that chapter that "opened the door" (not a literal door, because the church is the people and not a building) that allowed people to enter the church.  The "keys" he used were the things he preached.

These "keys" included the peoples need to believe with confidence ("know assuredly" - vs. 36) that Jesus was the Christ, and that they needed to "repent and be baptized" (vs. 38).

Notice the command in verse 38 was "in the name of Jesus Christ".  That phrase means "by the authority of" or according to the direction and instructions of. (see Mark 16:15-16, Matthew 28:18-20)

Basically Peter was saying he commanded this because Jesus had already commanded it, and Jesus has "all authority"!  

It was already "bound in heaven" so that is what Peter preached.  (Not the other way around.)

He told the apostles to go out preaching and it was dangerous territory.  But they went out preaching and saved the people from false teachings and lies by false religion.  So they literally opened up the kingdom of heave to them.

I agree with this man's opinion.

This promise, emphatically delivered to Peter here, was also the property of the Twelve and not Peter's exclusively (see under Matthew 18:18). Origen, under the sub-title, "The promise given to Peter, not restricted to him, but applicable to all disciples like him," asked,    But if you suppose that upon one Peter only the whole church is built by God, what would you say about John the son of thunder or each one of the apostles?[8]"Bind" and "loose" refer to the power of deciding what was lawful or unlawful to be done in the church or what was orthodox or unorthodox to be believed. That power was (and is) exercised by all the apostles, and the New Testament is the instrument by which that binding and loosing are effected.The objection may be raised that if all the apostles exercised that authority, the words lose their meaning as applied by Christ to Peter in the instance before us. This is not the case. A certain preeminence DID pertain to Peter: (1) He preached the first gospel sermon (Acts 2:14ff). (2) He unlocked the secret of the Davidic kingdom (Acts 2:31). (3) He unlocked the secret of HOW people enter the kingdom (Acts 2:38). (4) He unlocked the door of faith to the Gentiles (Acts 10:1ff). (5) He unlocked the door of return for backsliders (Acts 8:13,22). (6) He unlocked the mystery of the new name (1 Peter 4:16). (7) He expounded the mystery of the new birth (1 Peter 3:21). (8) He revealed the ultimate fate of the earth (2 Peter 3:11-13). These remarkable options exercised by Peter might be said to be his use of the keys, solving, unlocking, and revealing great mysteries of the kingdom of heaven in those important aspects. Surely such does constitute great honor and dignity conferred upon Peter by our Lord by reason of his having been the first to ascertain the holy truth of God in Christ, and then confess it; and the distinctions noted herewith are far more than enough to fulfill Jesus' words without resort to the monstrous notion that Peter was to be made, in any sense, the head of the church, which by its very nature can have only one head - CHRIST.

That is ancient superstition and as such is meaningless.

Matthew 16:19

King James Version

19 And I will give unto thee the keys of the kingdom of heaven: and whatsoever thou shalt bind on earth shall be bound in heaven: and whatsoever thou shalt loose on earth shall be loosed in heaven.

Jesus has the keys and is best to follow him if you want is everlasting rewards and do not do anything to dishonor him and all that he did for humanity. 

Jesus bestowed on Peter some very important privileges in that congregation.

 He did not give Peter primacy over the other apostles, as some have assumed, but he gave him responsibilities.

 He gave Peter the keys of the kingdom. Matt 16:19

 It would be Peter’s job to open the hope of entering God’s Kingdom to three different fields of mankind first to the Jews, then to the Samaritans, and finally to the Gentiles, or non-Jews.

Everybody that preaches the Gospel is involved with this.  Peter was the first in Acts chapter 2, but now it is for everyone preaching the Gospel.  A person preaching the Gospel that is believed, can confirm that the believer is saved.  The person that refuses to believe, can be confirmed as not saved.  The Lord Jesus Christ is God, and He loves you.  Believing in the Lord Jesus Christ means being forgiven all sins past and future, and means going to heaven and not hell.  Death leads to immediate heaven or hell, and it is too late to be saved, after death.  All believers still sin.  See 1 John 1:8.  To be in heaven and not hell, believe in the Lord Jesus Christ, who is God and who died on the cross and shed His blood to pay for all of our sins in full, and who was buried, and who resurrected from the dead.  The only way to avoid hell is by believing in the Lord Jesus Christ, without adding any of your own works.  See Romans 4:5, 1 Corinthians 15:3-4, and John 3:16.