Mary Magdalene followed Christ with the Disciples.

How many disciples?
There were 12 disciples. Judas betrayed Christ, and was replaced by Mathias.

The Disciples of Christ are Christian, from the Protestant branch of Christianity. Jewish people generally do not believe that "Christ" has come yet, and those people who do believe he came are called Christians (followers of Jesus Christ). So, the Disciples of Christ would be gentiles, since they are not Jews.

It is worth noting that "Disciples of Christ" is the name of a particular church, not a general term for those who follow Christ.

John is one of the disciples of Jesus Christ.

A disciple is a follower of Christ. An apostle is one who is set apart or ordained as a leader is Christ's church. There were, and are 12 apostles to serve in Christ's church. There are millions of "disciples" or followers of Christ.