Because of its Spanish heritage, Texas originally was entirely Roman Catholic except for unconverted Indians.

Geographically, Texas tends to be heavily Protestant in the north and east and Catholic in the south and southwest. Leading Protestant denominations and their known adherents in 2000 were the Southern Baptist Convention, 3,519,459; the United Methodist Church, with 1,022,342 adherents; Churches of Christ, 377,264; Assemblies of God, 228,098; the Presbyterian Church USA, 180,315; the Episcopal Church, 177,910; Independent Charismatic Churches, 159,449; the Church of Jesus Christ of Latter-Day Saints, 155,451; the Evangelical Lutheran Church in America, 155,019; Independent Non-Charismatic Churches, 145,249; and the Lutheran Church—Missouri Synod, 140,106. Roman Catholics numbered 4,368,969 in 2000. There were an estimated 128,000 Jews, 114,999 Muslims, and about 10,777 adherents to the Baha'i faith.