a religious person who believes Jesus is the Christ and who is a member of a Christian denomination

Adventist / Second Adventist - a member of Christian denomination that expects the imminent advent of Christ
Gentile / non-Jew / goy - in this sense `Gentile'' denotes a Christian as contrasted with a Jew
Protestant - an adherent of Protestantism
Friend / Quaker - a member of the Religious Society of Friends founded by George Fox (the Friends have never called themselves Quakers)
Catholic - a member of a Catholic church
Old Catholic - a member of the church formed in the 19th century by German Catholics who refused to accept the infallibility of the Pope
Copt - a member of the Coptic Church
Apostle - (New Testament) one of the original 12 disciples chosen by Christ to preach his gospel
Apostle - any important early teacher of Christianity or a Christian missionary to a people
arianist - an adherent of arianism (the belief that Jesus Christ was not truly God)
born-again Christian - a Christian who has experienced a dramatic conversion to faith in Jesus
communicant - a person entitled to receive Communion
Melkite / Melchite - an Orthodox Christian or Uniate Christian belonging to the patriachate of Alexandria or Antioch or Jerusalem
Melkite / Melchite - an eastern Christian in Egypt or Syria who adheres to the Orthodox faith as defined by the council of Chalcedon in 451 and as accepted by the Byzantine emperor
Nazarene - an early name for any Christian
Shaker - a member of Christian group practicing celibacy and communal living and common possession of property and separation from the world
Tractarian - a follower of Tractarianism and supporter of the Oxford movement (which was expounded in pamphlets called Tracts for the Times)
Timothy - a disciple of Saint Paul who became the leader of the Christian community at Ephesus
Titus - a Greek disciple and helper of Saint Paul

    church     Christian church

    religionist     religious person

following the teachings or manifesting the qualities or spirit of Jesus Christ

    christianly     christlike     christly

    unchristian

relating to or characteristic of Christianity; "Christian rites"

    Christianity     Christian religion