The main religions in North America are Protestantism, Catholicism, Judaism, Islam, Sikhism and Buddhism. A large number of people in North America classify themselves as "other," which can refer to other forms of Christianity that merge multiple faiths into one.
The classes of religion in North America can be combined down even further because the Protestant and Catholic religions are both covered under the umbrella term of Christianity. Many religions have common ground, but the term Christianity can apply to more sub-categories than exist in most other religions. Protestant Christians, for example, can cover people who call themselves Baptists, Lutherans and Pentecostal. All of these sub-groups are covered under the main group of Christianity.