What makes a true disciple of Jesus Christ is following the commandments of God. The Lord Jesus Christ came into the world just for the purpose of returning men back to God. We have been separated from God. Everyone of us had follow our own sinful ways. We had refused to follow the ways of God. So, Jesus Christ came into the world to save sinners. When he had saved those who accepted his message of salvation, he taught them about the things that will help them to stand to the end. He showed us a more excellent way through the word of God. So, to follow Him to the end, we will need to keep to the teachings of His word.
The disciples follow the teachings of their master. Our Master and our Teacher is the Lord Jesus Christ. We must listen to him. What makes a true disciple is the ability to listen to the commandments of God and follow them. Just answering to the name of a christian does not qualify someone to be a true disciple of Jesus Christ. Our obedience to the teachings of God is the thing that proves us as the true disciples of Jesus Christ.