Those who are following the commandments of Jesus Christ are His disciples. If I am following the doctrines of Jesus Christ, then I am one of His disciples. If you are following the teachings of Jesus Christ, you too are one of His disciples. So, what makes us the disciples of Jesus Christ is the obedience to the commandments of God. If we are not obedient to the teachings of God then we are not any good of His disciples. When we obey everything that we are taught in the the word of God and teach others to do the same that is what shows that we are the disciples of Jesus Christ.
No one will be able to obey what he or she has not learnt. If we are the disciples of Jesus Christ, we must learn the Word of God and understand it very well. We must acquaint ourselves very well with the doctrines of Jesus Christ. A true disciple will be a true ambassador. That is what we should be. We should be true ambassadors of the word of God. We should uphold and defend the doctrines of the church. We should not deviate from it to the right or to the left.