Deliberately rejecting the temptations not to worship with other believers regularly, not to pray and study the Bible, not to stand up for Jesus. We are to become pupils to Jesus, our teacher. To come under his authority, accepting it as true, submitting to him. 20 and teaching them to obey everything I have commanded you. Teaching is an important thing for the church to do and for Christians to receive, for it enables us to grow in our faith and become more like Jesus.
True disciples hear, understand, and obey.
Either by an individual or a family. Baptism doesn't make someone a Christian. It is a public, visible, outward sign of something that has happened spiritually and inwardly. It is a sign of dying to self and submission to God the Father, Son, and Holy Spirit. When someone is baptised they are baptised into the world-wide church of believers.