Nonsense.
The “keys of the kingdom” image comes right out of Isaiah. It means that Peter (and his successors) are the Prime Ministers of the kingdom.
Why do you argue against Catholicism with lies—such as “Peter, instead of Jesus, is the chief cornerstone of your church”? That is just a lie about what the Catholic Church teaches about itself.
What good is supposed to come from an argument based on a falsehood?
This reminds me of all those people who keep posting that “Catholics worship Mary...Catholics worship statues.” You can show them fifty Catholic catechisms from the last 500 years, all of them condemning idolatry, and they just keep posting “Catholics worship Mary...Catholics worship statues.”
When a person argues against Catholicism with bald misstatements of what Catholics believe, all he accomplishes is to proclaim his own intellectual dishonesty.
We know what worship means and we watch what you do...What you say you do has little to do with the truth...
You have turned Mary into a supernatural power which then is a god(dess)...You kneel and pray to her and ask her to award you with salvation, grace, peace, help, health and every other thing under the sun that only God can provide...That's worship whether you like the term or not...
The keys are addressed here as well:
“Go ye into all the world, and preach the gospel to every creature. He that believeth and is baptized shall be saved; but he that believeth not shall be damned.” Mark 16:15,16
“And that repentance and remission of sins should be preached in his name among all nations, beginning at Jerusalem”. Luke 24:47
“Whose soever sins ye remit, they are remitted unto them; and whose soever sins ye retain, they are retained.” John 20:23
(I’m sure you have Matt. 28:19 memorized)
And indeed Peter was at the forefront, preaching to the Jews:
Then Peter said unto them, “Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.” Acts 2:38
Praying and laying hands on the Samaritans (part Jew, part Gentile) that Philip had preached to:
“Then laid they their hands on them, and they received the Holy Ghost”. 8:17
And the Gentiles:
“While Peter yet spake these words, the Holy Ghost fell on all of them which heard the word.....Then answered Peter, Can any man forbid water, that these should not be baptized, which have received the Holy Ghost as well as wee? And he commanded them to be baptized in the name of the Lord.” 10:44-48
So, we see that the Lord had arranged it so that Peter HAD to be present for the outpouring of the Holy Ghost on the three divisions of mankind.
Do you, or do you not, believe that the church is founded upon Peter?
Do you, or do you not, believe that Mary hears your prayers, and everyone else’s around the world, at the same time (which makes her omnipresent)?