Jesus said He WOULD build it in Matthew 16:18, but in the gospels it is always spoken of in future tense.
Jesus said that he would build it upon Peter's following confession,
Mat 16:15
He saith unto them, But whom say ye that I am?
Mat 16:16
And Simon Peter answered and said,
Thou art the Christ, the Son of the living God.
Mat 16:17
And Jesus answered and said unto him, Blessed art thou, Simon Barjona: for flesh and blood hath not revealed
it unto thee, but my Father which is in heaven.
Mat 16:18
And I say also unto thee, That thou art Peter, and upon this rock I will build my church; and the gates of hell shall not prevail against it.
and he has been doing just that since long before Peter was ever born.
He told Peter That he would give him the “keys to the kingdom”.
Mat 16:19
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.
Seemingly, you do not understand what these
keys are or what the type of binding and loosing Jesus spoke of is really all about.
Elsewhere, and along these same lines, Jesus said:
Mat 18:15
Moreover if thy brother shall trespass against thee, go and tell him his fault between thee and him alone: if he shall hear thee, thou hast gained thy brother.
Mat 18:16
But if he will not hear
thee, then take with thee one or two more, that in the mouth of two or three witnesses every word may be established.
Mat 18:17
And if he shall neglect to hear them, tell
it unto the church: but if he neglect to hear the church, let him be unto thee as an heathen man and a publican.
Mat 18:18
Verily I say unto you, Whatsoever ye shall bind on earth shall be bound in heaven: and whatsoever ye shall loose on earth shall be loosed in heaven.
It is the same principle of that which is bound on earth shall be bound in heaven, and that which is loosed on earth shall be loosed in heaven, and it has everything to do with whether or not one meets the prerequisites for reconciliation.
Along these same lines, Jesus said:
Jhn 20:21
Then said Jesus to them again, Peace
be unto you: as
my Father hath sent me, even so send I you.
Jhn 20:22
And when he had said this, he breathed on
them, and saith unto them, Receive ye the Holy Ghost:
Jhn 20:23
Whose soever sins ye remit, they are remitted unto them;
and whose soever
sins ye retain, they are retained.
Again, if someone meets the prerequisites for reconciliation, in this case, and in Peter's case, with God, then we can tell them that they are loosed from their sins or that their sins have been remitted. Contrariwise, if they do not meet such prerequisites for reconciliation, then we can tell them that they are still bound in their sins or that their sins are retained. This is what Jesus was talking about, and it will become even more evident in a moment.
Peter is the one who will “open” the door of the kingdom.
I am sorry, but this simply is not true. Granted, Peter could open the door to the kingdom in the manner in which I just explained, but that door was open long before Peter was ever born. For example, Jesus said:
Mat 8:10
When Jesus heard
it, he marvelled, and said to them that followed, Verily I say unto you, I have not found so great faith, no, not in Israel.
Mat 8:11
And I say unto you, That many shall come from the east and west, and shall sit down with Abraham, and Isaac, and Jacob, in the kingdom of heaven.
Mat 8:12
But the children of the kingdom shall be cast out into outer darkness: there shall be weeping and gnashing of teeth.
Jesus said that Abraham, Isaac, and Jacob would be in the kingdom of heaven, and they all lived and died long before Peter was ever born. If Peter alone was given the keys to the kingdom, then how did Abraham, Isaac, and Jacob get in before Peter was ever even born? What you are saying here reeks of Papal authority, and it has no real basis in rightly divided scripture.
In Acts 2, at Jerusalem, with Jews from every nation there, Peter preached the first gospel sermon.
I am sorry, but this simply is not true either.
The first gospel proclamation was made in the garden of Eden.
Gen 3:15
And I will put enmity between thee and the woman, and between thy seed and her seed; it shall bruise thy head, and thou shalt bruise his heel.
Abraham also had the gospel preached unto him.
Gal 3:8
And the scripture, foreseeing that God would justify the heathen through faith, preached before the gospel unto Abraham,
saying, In thee shall all nations be blessed.
The children of Israel also had the gospel preached unto them.
Heb 4:2
For unto us was the gospel preached, as well as unto them: but the word preached did not profit them, not being mixed with faith in them that heard
it.
In fact, Paul said that he preached the same gospel message of righteousness by faith that Moses preached to the children of Israel way back in Deuteronomy 30:11-14.
Rom 10:6
But the righteousness which is of faith speaketh on this wise, Say not in thine heart, Who shall ascend into heaven? (that is, to bring Christ down
from above)
Rom 10:7
Or, Who shall descend into the deep? (that is, to bring up Christ again from the dead)
Rom 10:8
But what saith it? The word is nigh thee,
even in thy mouth, and in thy heart: that is, the word of faith, which we preach;
Rom 10:9
That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.
Rom 10:10
For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation.
I could just as easily pick apart the rest of your post, not that I take any pleasure in doing so, but I will pause here to see whether or not you recognize that the things you stated which I have already addressed are simply not true.