The largest religious group in the world are Christians. There are over 2,200,000,000 Christians worldwide and the religion is still growing strong. This is almost 1,000,000,000 more than the second largest religion, Islam.
The largest major religions are Christianity, Islam, and Buddhism, in that order. Each of these is further subdivided into denominations (called "churches" in the case of Christianity). The largest subdivision of Christianity is Catholicism. The largest subdivision of Islam is Sunna Islam.
Catholics
The largest religious group in Russia and the western former Soviet republics are Orthodox Christians.
catholic
Shia
The largest religious group in Afghanistan A+
Islamic
baptist chrstian
Roman Catholic
Chinese
Orthodox Christianity
In polling, the largest single group is "no religious affiliation." Protestantism is the most practiced religious sect, followed by Catholicism. Sikhism is the largest non-Christian religious group.
cristinatity