When I think of the Protestants, I think of an anything goes sort of place, except there'll be no talk of Jesus' Mother Mary except at Christmas, or spiritual miracles such as Mary appearing to many around the world, or even Jesus, for that matter. They're more open to anyone and some even open to any lifestyle, but not so open to the various reported spiritual manifestations around the world, or modern prophecies or warnings.
When I think of the orthodox, I really don't know much about them, but they seem more ritualistic like the Catholics than the Protestants. I have heard that they observe the correct date for Easter.
As I watch the various factions shooting poison arrows at each other from their positions of superiority, I've come to feel somewhat blessed to have not been born into a religious family. I've not had much indoctrination of faith to overcome while looking everywhere to find my own answers.
As a friend used to say of the world's religions: "They all have a piece of the Truth."
I recently read the book "Shocked by the Bible" and have wondered what else we have wrong.
In the messages recorded in "True Life in God" Jesus speaks about putting His Body back together after we have ripped His Body apart.
He has His Work to do! We rebellious humans are going to fight Him and not let Him put His Church back together.
Apparently, He has a surprise for us that will make many see things His way who don't now. He hasn't stopped loving each of us, not even for a microsecond. (Just don't make Dad put His Judge hat on.)
You've cited what is oft quoted as being the reason the Catholic Church is the "one true church" and I think it's important to examine exactly what Christ meant when he said to Peter, "on this rock I will build my church."
Was Peter, the man what Christ intended when he said "on this rock I will build my church?
Or what it really the TRUTH that Peter spoke upon which Christ said "on this rock I will build my church and the gates of Hades will not overcome it. ."??
Jesus asked him, "Who do you say I am?" to which Peter replied "You are the Christ" (Messiah.) Jesus often used parables to make his point, as I believe he did in this case also. Assuming Jesus used a parable, Peter's response to Jesus was the Truth, and therefore the Truth upon which His church is built.
We could also take a logical approach in coming to a conclusion. Therefore, in this case what makes the most sense? Was Jesus saying to Peter He was building His church around the man, Peter, or was he saying He was building His church upon the Truth Peter spoke? If the Church were to be built on Peter (as Catholics claim due to Peter being the first Pope) then that would mean Jesus rebuked the 11 other Disciples and their teaching from that moment forward was invalid. If that were true, we'd have a completely different Bible, would we not?
The only logical conclusion therefore is that Jesus followed his method of teaching using parables and examples. Of course Jesus didn't say the other eleven Disciples teaching was wrong. Jesus was simply stating (IMO) this His church would be built upon the Truth that Peter spoke, that Jesus Christ is our Messiah.
The proof of that Truth and the conclusion I draw is contained throughout Matthew, Mark, Luke and John. All of which tell the exact same story of Christ.
None of the above is to say that the Catholic Church is the only church, nor is it intended as a slam against the Catholic Church either. First and foremost in any Church is "Who is Jesus? He is the way, the truth and the life. None shall enter heaven except through him. He is our Lord and Savior. He suffered and died for our Sins. He was buried, and on the third day he was Resurrected, defeating death so that we may live. He is our Lord and Savior."
Any church with this as their core message has built their church upon the Rock, the Truth that Peter spoke. (IMHO.)