I like the Heidelberg catechism. http://www.heidelberg-catechism.com/en/. Ministers would use it as a tool to teach the Bible in its entirety as they elaborate on the summary & Scripture. The Heidelberg Catechism is reformed or protestant & similar to the Westminster Confession that sits behind Presbyterian teaching.
In my experience over the years I have seen ministers skip over texts & chapters & jump from book to book. In a way they become their own catechism as they dictate what the congregation hears. This can be a good thing if a minister is competent, reliable & faithful to the text & is serious about teaching all of God’s Word but it can also turn out to be wishy washy & jumbled if a minister is negligent & sporadic no matter how passionate they may be.
If you don’t know the Bible you probably wouldn’t notice, but if you do, things can be obvious enough even if most of the congregation haven’t gone to Bible College. From Scripture we are reminded that teachers will be judged more strictly. James 3:1. As we teach & admonish one another. Col 3:1-17.
We are to be like farmers that pick & choose carefully or
consumers that walk the shopping aisles with discernment.