Christianity has many divisions, or 'denominations'. The oldest existing denominations are the Roman Catholic Church and the Eastern Orthodox Churches. The Protestant Churches broke away from the Roman Catholic Church in the 1500s.Members of all these denominations are Christians, whether they are Catholic, Orthodox or Protestant.AnswerThe only difference would arise is when the person who is a member of a Protestant church is not a Christian but only a church member. Not all churches require people to be Christians in fact, to be members. Many in fact are not. Many churches also do not require their leaders and pastor/preachers etc to be Christians eitherFurther to this, many Protestants are in fact Christians (as are many Catholics) and in theory at least there ought not to be any differ