**It’s not Biblical.**
Indeed it is. Even though Peter fell three times, he also confessed hisw love for Jesus three times. Then Jesus gave him three commands: “Feed my sheep.” Tend my lambs.” “Tend my sheep.” Thus Christ gave the keys to the kingdom to Peter and made him the first Pope.
The church — that’s us — all of us are those sheep. Even if you aren’t Catholic.
This is about the only thing I see you wrote I agree with. Peter denied his Lord three times. And the verse about those keys is the "race card" equivalent for Catholics. When you pull that one out (I notice you didn't cite it or give an exact quote), I'm supposed to roll over and say "Oh no, you got me there". But I'm not. My interpretation of the verse is quite different from the Catholic Churchs.