Anyways, I say this not to debate with you. But I am merely trying to understand why you don't find these things I mentioned disturbing to your soul.
I will answer you: the fact that they appear, or do not appear, in the Bible is of zero concern. The Bible is neither the Constitution nor the lawbook nor the final revelation of anything, for Catholics. The Bible is a book, produced by Catholic authors. It contains SOME, by no means all, of the history. It is not a law book. It is not a rule book. It is not a higher authority. The authority is God, He expresses it through the Church, the Bible is a written historical artifact of the Church, from a certain time and place and set of people. It contains the words of Jesus, and that's important. But the seated Pope and Bishops have the authority of God in THIS time and place. Paul had it in his, but he does not have any binding authority at all in the world today, or after he died. The Bishops that succeeded him have the authority.
The Bible is not the center of Catholic religion, at all, so the fact that Catholics do something that is in the Bible, or don't do it, is not relevant to Catholics. To Protestants, of course, the Bible IS the lawbook, the rulebook, the Constitution, and Paul is not merely a long-dead bishop with ideas for his flock then, but a very fount of the living God.
Catholics' view of Mary, for instance, is informed by the fact that the God sent Mary as his emissary time and time again: at Guadelupe, at Lourdes, at Fatima and elsewhere. Mary has revealed additional things from God that were not revealed in the time of Christ and that are not in the Bible. And she revealed these things accompanied by miracles, notably the healing miracles at Lourdes that still go on to this day. Healing miracles cannot come from the Devil, so the fact of the open miracles accompanying the messages from God through the Mother of God is God vouching for the truth of what she has said, just as God gave Jesus the power to perform miracles as signs to those who heard him that he was the real deal.
Of course none of these Marian missions are in the Bible - they happened afterwards - but that is WHY Catholics are so devoted to Mary in particular: God has sent HER, specifically, from Heaven to be his diplomat on several occasions.
Now, because this is not in the Bible - for the obvious reason that the last parts of the Bible were written in the First Century but God sent Mary in later centuries - the Protestants cannot look at it, cannot hear it, cannot see it, and cannot accept it.
Catholics know that Transubstantiation is true because God demonstrated it to be so through eucharistic miracles over the ages. Those miracles are not in the Bible, so Protestants are left arguing about a few words and can't look at the positive physical proof that God provided.
Likewise the communion of saints. A few hundred saints died and didn't rot: strong proof of God's grace. Not in the Bible, of course, because all of this came AFTER the Bible. It's proof of the uniqueness of saints, and therefore Catholics revere the saints. But this wasn't happening YET at the time of the Bible, so Protestants have to wall their minds off against all of it (just as the Jews walled their minds off against Jesus in his day, because he is not EXPLICITLY and CLEARLY written out in their Scriptures. Sure, looking backwards with the knowledge that he's the real deal, supplied by his miracles and his greatest miracle: the Resurrection, WE can tease oblique and indirect references to Jesus from the Old Testament, but it's all indirect, and it can only be seen for sure looking backward through the lens of the miracles that Jesus did, including his resurrection. Take the miracles out, and he was just a rabbi who was executed for blasphemy and the Jews were right - within their belief system.
This is why Catholics and Protestants cannot talk to each other and understand each other.
The issue between Catholics and Orthodox is related, but different, and not at issue here, so I won't elaborate.
Now, truth is, most Catholics do not have the full story of the faith down. Catholics who are interested can mine the history and find out WHY we do this or that, but few do. Most just accept what they are taught. When a Catholic converts, it is generally a Catholic at the fringe of Catholicism, who doesn't know the historical roots of the beliefs that differ with the Protestants, who does not account for the way that Divine Intervention SINCE the Bible has changed the direction of the Church.
All of those things on the quiz list ARE very clear differences between Catholicism and Protestantism, and there are reasons the Catholics believes all of them. Catholics who don't know the history and haven't looked at the miracles do wander away. Catholics who have looked at the miracles directly realize WHY we do the things we do: they are based on Divine Revelation that has come AFTER the First Century.
This divide in theological belief is not really bridgeable.
But goodwill and patience between Catholics and Protestants IS possible, just as it is possible between Christians and non-Christians. Human beings can still interact peaceably, but to do so that usually means not going down the road of "You are wrong because you don't believe what I believe."
People believe what they believe because they were taught it as children. That's fine. Leave them be.
If we want to talk comparative religion, it's important that we understand WHY the other believes as he believes.
Mostly, proselytizing types don't care why. They're certain they are right and on a mission from God to do thus and so. Generally speaking, they look to me to be on a mission from their own ego, or from other powers, because I am just as certain my religion is right as they are of theirs.
The nature of chat sites is that people argue and fight, because they like that.
I'd prefer that we came to understand each other better.
Part of that understanding, between Catholics and Protestants, is to know WHY the other believes as he believes. To convey just that without insult is hard. Few put in the effort.
