Brother,
That is a good question there is a usefulness to Catechism or systematic questions answering the faith we believe.
the Bohemian Brethren and renewed Moravians used it:
The Catechism of the Bohemian Brethren. Translated from the old German, with an Introduction
https://archive.org/details/jstor-41179521
Methodism (John Wesley) used this method for training.
Catechism for the use of the Methodist missions :
https://archive.org/details/catechismforuseo00cape
another here: http://archive.org/stream/catechismmethod00churgoog#page/n12/mode/2up
John Wesley regarded all members as probationers and called them "catechumens.”According to Frederick Norwood, "He considered that he was following apostolic precedent in separating from the body of ‘hearers’ those who were convinced, and organizing them into a society of ‘catechumens.’”
I just learned that those preparing for baptism in Augustine’s congregation were likely required to study if not master (memorize) 800 excerptps [sic] of scripture totaling 60,000 words, some as long as Matthew 5-7. They were arranged as they appeared in Scripture from Genesis to Revelation. If quoted start to finish, it would take approximately six hours of consecutive quotation.
Cyprian’s students only had to master 33,000 words arranged topically! They could be quoted in three and one half hour.
Of course we can go much further in the Biblical account of the Book of Acts in introducing much training before baptism (that was the origin of the Catechism). But there is a usefulness in memorizing Scripture and some systematic answers to our holy faith in the Lord.