Pahpa, yes, the Catholic Church really does believe it is the church founded by Christ, that the Pope is the vicar of christ, and that it and the Orthodox churches are the only ones in apostolic succession. Jesus Christ didn't start a huge group of conflicting churches. He started one. Schism is always considered sin and unity is the best solution. However, the Catholic Church isn't going to change what it teaches in order to woo back the schismatics. It has to be faithful to Christ.
Regarding the history of the Church, read a book called "Triumph" by Crocker, see what you think.
And don't expect perfection from anything on this Earth. If there are people involved, there is going to be imperfection and scandal. The Church started with scandal, i.e., Judas betrayed Christ and then Peter denied him. But Jesus saw Peter's quality and he was redeemed. Fortunately, the early christians chose to focus on Peter and not on Judas. Christ chose flawed and broken people to work with Him and, frankly, no one on this Earth isn't flawed and broken. I think expecting perfection from religious people is a holdover from the JW insistence on perfection. Just because people do things that are wrong, even in the name of religion, doesn't mean God is bad, if people choose to do things their way and not His way.