S’Nami Boh!
As a catechist in a Latin parish trained for three years with a cohort also mainly training to become master catechists in the diocese and having gone to a number of national and regional workshops on aspects of the catecheumenate and mystagogy.I know a number of great catechists and we do teach seriously and systematically about Catholicism.
I’ve been rather shocked to discover that it’s quite normal now for people to come into Inquiry having grown up in the US and have zero literacy about sacred Scripture. When I was growing up in the 50s everyone would have known who Adam & Eve were, Moses, Jonah, Noah, the prodigal son, not to mention Christ and His disciples, etc. they probably knew the basics of a number of stories and they knew perhaps some psalms, many of the 10 Commandments, etc. They might not have a real understanding of these but they did know something of God’s action in salvation history, maybe thanks to Cecil B. DeMille.

Now, we are stopping throughout any given weekly RCIA session, which sessions are based on the liturgical year, anchored on Sacred Scripture and the CCC, to need to give information on the most basic of Christian literacy so that whatever we’ve just read will make sense.
Thankfully our RICA follows the US Bishops National Statutes that persons be in the catecheumenate, ie have gone through the
Rite of Acceptance into the Order of Catechumens, for at minimum one full Liturgical year before the Celebration of the Sacraments of Initiation at the Easter Vigil. In a year + many Catholic teachings will naturally come up a number of times within the context of the particular intended teaching for that session. Many parishes still do not follow the US Bishops National Statutes and try to prepare people beginning in the fall and concluding with the first Pascha that comes along. This can be a very short period of the catecheumenate.