[quote="ProfBJS, post:1, topic:314409"]
I read on one protestant website that Mt. 18:1; 20:21, shows that Jesus had the chance to tell the disciples that Peter was the Pope but he did not. Thus showing that Peter was not the Pope.
Bleh -- that's eisegesis at its worst! OK: in Mt 18:1, the question wasn't "who's going to be the leader of your Church on earth?" After all, the apostles are regularly shown to be unable to understand Christ's message prior to his resurrection -- in fact, the point of the Synoptic Gospels, which they make over and over again, is that it's impossible to understand Jesus without first knowing his passion, death, and resurrection! Just a few verses before Mt 18:1 (in Mt 17:22-23), Jesus predicts precisely these events, and rather than understand it, they're "filled with grief"!
So, at the very least, the statement "Peter will be the head of my Church on earth" would have been completely incomprehensible to the apostles; that's reason enough for Jesus not to go there, prior to his resurrection. But, there's an even better reason: that wasn't the question that Jesus was asked! Instead, he was asked who was greatest in the kingdom of God! Time and again, Jesus teaches his apostles the value and necessity of servant leadership -- so, Jesus would never point to one of his budding leaders and say, "he's the greatest!" In fact, that would be the surest way to know that a person wasn't being prepared for leadership in the Church! So, instead, Jesus points to a child -- to a person who was well understood in the culture of the day as being inconsequential -- and letting people know that the whole order of things is upended in the Kingdom of God: the mighty become as children, while the weak are the greatest.
Mt 20:21 provides a similar dynamic. She only thinks she's asking for temporal, earthly power -- what she's really asking for (although she doesn't know it) is power in the eschatological Kingdom of God. If Jesus had replied "sorry, Peter's got the edge over your boys", then Jesus would have been mis-speaking: rather than tell the truth about the Kingdom of God, he would be talking about temporal leadership. Instead, Jesus answers properly: you don't know what you're asking for, he replies. Again, Jesus teaches the apostles (cf Mt 20:25ff) about the need for servant leadership.
So, in addition to the very reasonable comments already part of this thread, I would offer that the websites you've read are offering Protestant eisegesis rather than Scriptural exegesis... ;)