Many views are held or have been expressed by religious organizations in relation to same-sex marriage. Arguments both in favor of and in opposition to same-sex marriage are often made on religious grounds and/or formulated in terms of religious doctrine. Although many of the world's religions are opposed to same-sex marriage, the number of religious denominations that are conducting same-sex marriages have been increasing since 2010. Religious views on same-sex marriage are closely related to religious views on homosexuality.