Adoption, in Christian theology, is the reception of a believer into the family of God. In the Reformed ordo salutis ("order of salvation"), adoption is usually regarded as a step immediately subsequent to justification. As a theological word, adoption has similar connotations to the act of parents who legally take responsibility for a child who was not originally born to them. There are three references in the New Testament to God "adopting" () Christians as his own children (Galatians 4:5, Romans 8:15 and Ephesians 1:5) and one reference to God adopting the "people of Israel" (Romans 9:4). Adoption as a theological term introduces a relational dimension to the consequences of salvation.Philip Ryken, Salvation, BST (Leicester: IVP, 2001): 206.

Adoption as a theological concept is also another consequence of the 'legal' act of justification, alongside redemption and reconciliation.Ryken, Salvation, 207. The Old Testament precedent for this term comes from the story of Mephibosheth, who despite not being part of Davidic family was included in the Royal inheritance (2 Samuel 9:7-13).Ryken, Salvation, 213-214 Adoption is an important feature of Reformation theology as demonstrated by article 12 of the Westminster Confession of Faith:'The Westminster Confession of Faith' Center for Reformed Theology and Apologetics, http://www.reformed.org/documents/wcf_with_proofs/ Retrieved 15 June 2009.

See also Sonship theology

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