To become one flesh and have a lifelong, monogamous relationship (they become one flesh' - Genesis)
To have a committed and loving sexual relationship (it is better to marry than to burn with passion' - St Paul)
To procreate and start a family ('be fruitful and multiply' - Genesis)
To fulfil the sacraments (marriage is one of the seven sacraments of the Catholic Church. It is a sacred covenant involving God. 'God himself is the author of marriage' - Catechism)
To support one another in a lifelong, loving relationship ('They become like garments for one another' - Surah 2)
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To fulfil a religious responsibility ('Marry those among you who are single' - Surah 24)
To procreate and start a family (Seen as a duty; reproduction is a gift from God).
To provide stability to society ('The only way to protect all people is to maintain a society where only a man and his wife share the act of sex' - Abdul Wahid Hamid).
May see cohabitation and same-sex marriage as wrong because it could lead to sex before marriage, which is seen as sinful - 'flee from sexual immorality' (St Paul)
May see no problem with cohabitation and same-sex marriage as 'it is the nature and quality of the relationship that matters' (Quakers). No obligation to be married in order to have loving, committed relationship
Oppose cohabitation and same-sex marriage because marriage is a sacred covenant involving one man and one woman. Leads to same-sex acts, which are sinful