I'm not at all saying that your interpretation is not shared by others.
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It appears that Catholics are wrong if they don't conform to what your personal interpretation of the Bible is and what you think is extra-Biblical." Add to that "
the Gospel of MMXX" from someone else. You guys have been rude and gotten way too personal. I've questioned things in Eastern Orthodoxy here before too, and EO members were much politer.
There are thousands of denominations that agree with each other, at least for a while until a new denomination is formed. My point was that it is a human interpretation and thus can be flawed. But as brought up, you switched your line of thought to the topic of whether something is mandatory or not within a religion. Of course the Catholic Church has a number of rules and disciplines, that's no secret. An example would be fasting on Ash Wednesday and Good Friday, Jesus fasted so the Church requires healthy adults of particular ages to fast. It's a minor thing but is helpful to bring your mind toward Jesus. Thus rules and disciplines fall under Jesus giving Peter the keys to the kingdom. As to Mary in the Bible, Mary was there for the Incarnation, there when Jesus was born, at her request he performed His first really public miracle, she was there at the foot of the cross, there in the Upper Room when the Apostles received the Holy Spirit, and is in Heaven in Revelation. Also in the Bible you can find where Jesus addresses her with the very respectful title of "woman" used back in Genesis for Eve, and where Jesus adds in that she is most blessed because she does God's will. Mary is part of salvation history.
I've heard a lot about thousands of denominations, but I'll bet most Christians, perhaps even you, couldn't name more than 15 denominations off the top of their head. And I bet if you named 50, probably 40 of them would be a branch of or a slight variation of about 10 main denominations. You say that human interpretation is flawed, yet the RCC goes with quite a lot of human interpretation. You can say oh but that interpretation is through the Holy Spirit, though divine revelation, but that's what everyone says.
Like I said, I don't have a problem with rules, disciplines and traditions in general. The church I go to acknowledges Ash Wednesday and I get an ash cross put on my hand (they do forehead or hand according to preference). They also acknowledge Lent and encourage us to practice it. We just finished 21 days of fasting and prayer (Daniel fasted and prayed for 21 days). I even observe Shabbat by refraining from work from sundown Friday to sundown Saturday as a discipline (but I strongly disagree with SDA and similar). I have no problem whatsoever with order and discipline.
Now I, like thousands of other Christians, don't quite see Mary in the same light as Catholics seem to. Like many I don't pray to Mary, because when Jesus taught us how to pray, he taught us to pray to the Father. You say Jesus called Mary "woman" but he also called the Canaanite woman at the well "woman".
Then Jesus said to her, “Woman, you have great faith! Your request is granted.” And her daughter was healed at that moment. Matthew 15:28. (the same word used for "woman" in Matthew 15:28 "gunai" is the same that's used in John 2:4). There's several of things that I, and many others, can argue over the Catholic view of Mary. But I'm not going to put you down for your view, belief and practice. And I freely acknowledge and confess that I, along with many others, could be wrong.
Another thing is Protestants too are against independent personal interpretation of the Bible. Most Protestants believe in adhering within orthodoxy and consensus. When someone on CF starts in with their own personal homespun interpretation of the Bible, I and others object to it. There's quite a list of things most Protestants agree with when it comes to what's considered orthodox and what's considered heresy or just plain nonsense.