The Catechism is much more in depth and complicated than any child could ever understand other than rudimentary basics. I would argue that an educated person could study the Catechism for years and still not grasp all of it. So, until we understand the minutia of the Catechism, why are we reading the Bible which we cannot understand anyway without the Catechism?
Actually, until
very recently, ALL Catholic children got their religious education by reading the Baltimore Catechism, which is available in a series progressing from basic to advanced. It is an ideal introduction to the faith. Versions are available ranging from early grades up to high school/college use. You have to understand that there are MANY Catholic Catechisms available. The “official” Catechism, if you look at the introductory notes, is a “master” Catechism that is to be used as a guide to come up with other Catechisms that address other ethnicities, ages, and so on better and more clearly than the original. The Compendium to the Catechism of the Catholic Church is a great example of this (and available online at the Vatican website). It re-presents the entire Catechism in a question-and-answer format for easier reading.
(By the way, when
I had my religious education in the 70s and 80s, the Catechism was rarely used, except by the teacher as a reference. We used other books, alongside the Bible.)
You wrote that much of the Bible is up for discussion and has not been infallibly decided by the Church. I said that all issues relevant to salvation have already been decided an are not up for discussion. So what I am asking is for an example of anything in the Bible that is relevant to salvation that has not already been decided and which is truely up for discussion.
Well, most of Genesis is up for discussion. Currently, the Catholic Church allows for either a literal interpretation, or one that accepts some form of evolution. Several
details have been defined, however. For example, the Church infallibly defines that there WAS an original pair of human beings named Adam and Eve (although, as I said, whether they were created intact by God or evolved is left to debate)
There’s a lot of room for discussion on Revelation as well. Again, there are infallible details that have been proclaimed, such as the identity of the crowned woman (Catholics definitively believe it to be Mary). However, if you want to see it as proclaiming the end times, or as a first-century allegory, or as a metaphor foreshadowing the Mass and worship in heaven, that that is all acceptable.