An interfaith marriage, also known as an interreligious marriage, is defined by Christian denominations as a marriage between a Christian and a non-Christian (e.g. a marriage between a Christian and a Jew, or a Muslim), whereas an interdenominational marriage is between members of two different Christian denominations, such as a Lutheran Christian wedding a Catholic Christian, for example.
Almost all Christian denominations permit interdenominational marriages, though with respect to interfaith marriage, many Christian denominations caution against it, citing verses of the Christian Bible that prohibit it such as 2 Corinthians 6:14–15, while certain Christian denominations have made allowances for interfaith marriage, which is referenced in 1 Corinthians 7:14–15, verses where Saint Paul addresses originally non-Christian couples in which one of the spouses converts to Christianity after the marriage between two originally non-Christian persons had already taken place. The early Christian Synod of Elvira prohibited interreligious marriage, teaching that "such marriages lead to the adultery of the soul."
