I have loved this study with the boys, but I’m not sure how to live this out practically in a post-Christendom world (the parts about being a silent bystander and question #100 in particular). Should I confront everyone who takes God’s name in vain – turn the channel every time I hear it? Not sure – thoughts? 

Question #99: What is God’s will for us in the third commandment? 

Answer: That we neither blaspheme nor misuse the name of God by cursing, perjury, or unnecessary oaths, nor share in such horrible sins by being silent bystanders. In a word, it requires that we use the holy name of God only with reverence and awe, so that we may properly confess him, pray to him, and praise him in everything we do and say (Lev. 24:10-17; Lev. 19:12; Matt. 5:37; James 5:12; Lev. 5:1; Prov. 29:24; Ps. 99:1-5; Jer. 4:2; Matt. 10:32-33; Rom. 10:9-10; Ps. 50:14-15; 1 Tim. 2:8; Col. 3:17). 

Question #100: Is blasphemy of God’s name by swearing and cursing really such serious sin that God is angry also with those who do not do all they can to help prevent it and forbid it? 

Answer: Yes, indeed. No sin is greater, no sin makes God more angry than blaspheming his name. That is why he commanded the death penalty for it (Lev. 5:1; Lev. 24:10-17).