Catechism is systematic oral instruction in the doctrines of the Christian faith, rooted in the NT practice of "catechizing" new believers. Luke uses the word katēcheō to describe Apollos, who had been "instructed in the way of the Lord" (Acts 18:25), and Paul uses it in Galatians 6:6 ("let him who is taught the word share all good things with him who teaches"). The pattern of structured doctrinal formation — summarizing the faith in memorable, transmissible form — reflects the church's duty to make disciples, not merely converts. The Shema (Deuteronomy 6:4–9) is itself a proto-catechetical command: teach, repeat, impress, pass on.
CAT'ECHISM, n. [Gr. katechismos, from katecheo, to instruct orally.] A form of instruction by means of questions and answers; particularly a book containing a summary of principles in the Christian religion, in the form of questions and answers, used for the instruction of youth in the rudiments of religion, and to prepare them for confirmation and communion.
Modern evangelical culture largely abandoned catechism in favor of felt-need programming, assuming that structured doctrinal formation was either too Catholic or too boring. The result is a generation of professing Christians who cannot articulate the Trinity, explain justification, or define the gospel with precision. The irony: "boring" catechetical instruction produces theologically grounded disciples who endure; exciting but shallow programming produces numerical growth that evaporates under pressure. The Reformers understood this — Luther, Calvin, and the Westminster Divines all produced catechisms precisely because they knew that faith without formation is a seed without soil.
• Deuteronomy 6:6–7 — "These commandments that I give you today are to be on your hearts. Impress them on your children. Talk about them when you sit at home and when you walk along the road."
• Acts 18:25 — "He had been instructed [katēchēmenos] in the way of the Lord."
• Galatians 6:6 — "The one who receives instruction [katēchoumenos] in the word should share all good things with their instructor."
• 2 Timothy 3:14–17 — "Continue in what you have learned and have become convinced of, because you know those from whom you learned it."
G2727 — katēcheō (κατηχέω) — to instruct orally, to catechize; the direct root of "catechism"
G3100 — mathēteuō (μαθητεύω) — to make disciples; the Great Commission verb linking catechism to discipleship
H8150 — shanan (שָׁנַן) — to whet, to sharpen; used in Deut 6:7 for "impress/teach diligently"
• The Heidelberg Catechism opens with Q1: "What is your only comfort in life and in death?" — A question that forces the believer to articulate everything that matters in a single breath.
• A father who catechizes his children at the dinner table is fulfilling Deuteronomy 6 as surely as any ancient Israelite patriarch.
• "I don't believe in creeds and catechisms" is itself a catechetical statement — it teaches children that doctrine doesn't matter. All formation is catechesis; the only question is whether it is intentional and true.