Modern usage

A wide range of beliefs and practices is found across the world among those who call themselves Christian. Philosopher Michael Martin, in his book The Case Against Christianity, evaluated three historical Christian creeds to establish a set of basic assumptions which include belief in theism, the historicity of Jesus, the Incarnation, salvation through faith in Jesus, and Jesus as an ethical role model. Included in his analysis were the Apostles' Creed, the Nicene Creed, and the Athanasian Creed.

The Ontario Consultants on Religious Tolerance say that “Who is a Christian?” is “a simple question with many answers and no consensus." They found a near consensus within individual faith groups.

Religious Tolerance claims that:

• Most liberal Christian denominations, secularists, and public opinion pollsters define "Christian" very broadly as any person or group who sincerely believes themselves to be Christian. Using this definition, Christians total about 75% of the North American adult population.
• Many Fundamentalist and other Evangelical Protestants define "Christian" more narrowly to include only those persons who have been "born again" or have made a personal commitment to follow Jesus irrespective of their denomination. About 35% of the North American adult population identify themselves in this way.
• Some Protestant Christian denominations, para-church groups, and individuals have assembled their own lists of cardinal Christian doctrines. Many would regard anyone who denies even one of their cardinal doctrines to be a non-Christian. Unfortunately, there is a wide diversity of opinion as to which historical Christian beliefs are cardinal doctrines.
• Other denominations and sects regard their own members to be the only true Christians in the world. Some are quite small, numbering only a few thousand followers.

In North America there are over a thousand faith groups including the Roman Catholic church; the Eastern Orthodox churches, other conservative, mainline, liberal and progressive Christian faith groups; The Church of Jesus Christ of Latter-day Saints (the Mormons); Jehovah's Witnesses, the Unification Church, Christian Science, progressive Christians, and other religious organizations. They all identify themselves as Christian. In fact, many regard their group as the only "true" Christian church. Yet they, and their followers, have very different beliefs about the life, events, teachings, actions, sinlessness and expectations of Yeshua. Also included as Christians are those who regard themselves as being followers of Jesus even though they do not affiliate themselves with any particular religious group. They appear to be growing in numbers.