What is the main difference between a true disciple of Christ and those who are not? It's not their external appearance. They probably look the same. It's not even their activities, for both believers and unbelievers can look very religious on the outside. The main difference between the two is the kind of love that each can exhibit. Of course, those who do not acknowledge Christ can still exhibit love. But the true disciple of Christ can exhibit a higher kind of love.