Reading your site is alot like reading "The DaVinci Code".
There are enough facts to be dangerous, but not enough facts to be right. To begin, be careful using the word dogma. You cite Papal bulls from the 1300s as dogma, when they are not. According to several Canon lawyers that I have studied with, the only things you HAVE to believe as a Catholic are contained in the Nicene Creed
"We believe one God, the Father, the Almighty, Maker of heaven and earth, of all that is seen and unseen. We believe in one Lord, Jesus Christ, the only son of God, eternally begotten of the Father, God from God, Light from Light, true God from true God, begotten, not made, one in Being with the Father. Through Him all things were made. For us men and for our salvation He came down from Heaven: By the power of the Holy Spirit He was born of the Virgin Mary and became man. For our sake he was crucified under Pontius Pilate; he suffered, died and was buried. On the third day He rose again in fulfillment of the scriptures: He ascended into Heaven and is seated at the right hand of the Father. He will come again in glory to judge the living and the dead, and His kingdom will have no end. We believe in the Holy Spirit, the Lord the Giver of life, who proceeds from the Father and the Son, With the Father and the Son He is worshipped and glorified. He has spoken through the Prophets. We believe in one, holy, catholic, and apostolic Church. We acknowledge one baptism for the forgiveness of sins. We look for the resurrection of the dead, and the life of the world to come. Amen"
Council of Nicea, 325 A.D.
This is what you must believe to be a Roman Catholic. Most main stream Christian religions are Creed based, with the exception of the Baptist Church and possibly the Bible Churches (not actually sure on that one).
As Catholics we do not believe that:
a) only Catholics can go to heaven
b) only Christians can go to heaven
The Catholic Church has chosen to take the position that only God decides who goes to heaven, and that Jesus' sacrifice on the cross assured salvation for all who accept it, and that the empty tomb is proof of our salvation. W I personally hope that God is much more forgiving than human beings are!
You quote documents that are 700 years old and in fact do not fall under the cloak of Papal infallibility which you seem to question. So webmaster, do you know how many times Papal infallibility has been invoked since it's inception? Once! And that decree was? Find out and let me know. Be very careful to distinguish between Dogma and the Ordinary Magisterium of the Church. They are not the same.
Every Roman Catholic is taught beginning in the first grade that only God can forgive sin. The priest in the confessional is simply an intermediary so that the penitent actually hears the words "You are absolved from your sins". In the early Christian Church public confession was required for transgressions against the community. Most Catholics will tell you that the act of naming your misdeeds makes them much easier to deal with. Which is worse, the prideful attitude that says "How dare you tell me I have to confess my sins to be forgiven?!" Or the directive that says "Everyone should come to God at least once a year to ask forgiveness for their sins." The Catholic Church also teaches that there is NO unforgiveable sin. You only have to ask. In fact, the Catholic Church also says that a perfect act of contrition is all that is needed to be forgiven for even a mortal sin. No priest required. Most people aren't comfortable with the concept of a perfect act of contrition so private confession is a more comfortable option. Occaisionally, Catholic Churches will have penitential ceremonies where a very large group of people are all granted absolution for their sins without actually talking to a priest. But having a priest talk to you about why this is a problem for you and give guidance for your spiritual life is actually a pretty good deal for the average person, and also may explain why Catholics have a significantly lower suicide rate than the general population.
Remember "Keep holy the Lord's Day" isn't something Rome made up. Jesus went to the synagogue on the Sabbath to honor His Father, we are just emulating Him. If you want to go straight to the beach and play in the sand instead of spending a whole hour or two hearing God's word and worshipping Him amidst a community of believers and then going to the beach or shopping or the movie, go ahead. Is one hour once a week asking so very much? Have dinner with your parents once a week, it keeps the relationship strong.
I could continue on, but I suspect that you don't really care. I would like to say that Yes, the Catholic Church does believe that it holds the full deposit of the Faith. Doesn't every church believe this? If you don't in your church, why in heaven's name are you there? Are you waiting for something better to come along? We, as Catholics, have simply moved away from the big foam finger and the "We're #1!" chant. Yes, we still know that we are right, but are still willing to say that you're probably not all wrong, and that God is gracious enough to allow room for error on humanity's part, after all look how badly we've messed things up over and over and over again!