As an orthodox christian, I agree that catechism is a great idea. Unfortunately, I can't find a Biblical example of it in relation to baptism.
I don't really understand the point you are trying to make about the catechism. I think that he means that the church leaders have to try to discern mere head knowledge from actual faith. God gives the church leaders and gifts them for His work. That doesn't mean they never err, but it does mean that churches are to draw a line between believers and unbelievers and warn those who are outside of Christ to repent and to believe. When the church blurs that line, it only gives false hope to those who are perishing.