Who is a Christian?
The definition of who is a "Christian" varies among different Christian groups. Roman Catholics, Eastern Orthodox, and many Protestants define a Christian as one who is a member of the Church, which one enters through the sacrament of baptism. In these churches, infants who are baptized may be considered Christians.
Some denominations teach that adult baptism is necessary for salvation — the transition from non-Christian to Christian (see Baptismal regeneration).
They define a Christian as one who has been baptized as a repenting adult. Others, including many who use the term
(John 3:3), believe that a Christian is one who believes and follows Jesus and repents of their sins.
Within countries where Christianity is the historical majority religion, the term is also used by some in a casual generic sense to indicate that they are not members of nor affiliated with any other religion – therefore considering themselves Christians by default.