Christian theologyChristian theology is the theology of Christian belief and practice. Such study concentrates primarily upon the texts of the Old Testament and of the New Testament, as well as on Christian tradition. Christian theologians use biblical exegesis, rational analysis and argument.
Penal substitutionPenal substitution (sometimes, esp. in older writings, called forensic theory) is a theory of the atonement within Protestant Christian theology, which declares that Christ, voluntarily submitting to God the Father's plan, was punished (penalized) in the place of sinners (substitution), thus satisfying the demands of justice so God can justly forgive sins making us at one with God (atonement). It began with the German Reformation leader Martin Luther and continued to develop within the Calvinist tradition as a specific understanding of substitutionary atonement.
Liberal ChristianityLiberal Christianity, also known as Liberal Theology and historically as Christian Modernism (see Catholic modernism and Fundamentalist–Modernist controversy), is a movement that interprets Christian teaching by taking into consideration modern knowledge, science and ethics. It emphasizes the importance of reason and experience over doctrinal authority. Liberal Christians view their theology as an alternative to both atheistic rationalism and theologies based on traditional interpretations of external authority, such as the Bible or sacred tradition.
Perseverance of the saintsPerseverance of the saints (also called preservation of the saints) is a Christian teaching that asserts that once a person is truly "born of God" or "regenerated" by the indwelling of the Holy Spirit, they will continue doing good works and believing in God until the end of their life. Sometimes this position is held in conjunction with Reformed Christian confessions of faith in traditional Calvinist doctrine, which argues that all men are "dead in trespasses and sins", and so apart from being resurrected from spiritual death to spiritual life, no-one chooses salvation alone.
Sanctification in ChristianitySanctification (or in its verb form, sanctify) literally means "to set apart for special use or purpose", that is, to make holy or sacred (compare sanctus). Therefore, sanctification refers to the state or process of being set apart, i.e. "made holy", as a vessel, full of the Holy Spirit of God. The concept of sanctification is widespread among religions, including Judaism and especially Christianity.
PurgatoryPurgatory ( purgatorium, borrowed into English via Anglo-Norman and Old French) is, according to the belief of some Christian denominations and Islam, an intermediate state after physical death for expiatory purification. The process of purgatory is the final purification of the elect, which is entirely different from the punishment of the damned. Tradition, by reference to certain texts of scripture, sees the process as involving a cleansing fire. Some forms of Western Christianity, particularly within Protestantism, deny its existence.
Justification (theology)In Christian theology, justification is the event or process by which sinners are made or declared to be righteous in the sight of God. The means of justification is an area of significant difference amongst the diverse theories of atonement defended within Roman Catholic, Eastern Orthodox, Oriental Orthodox and Protestant theologies. Justification is often seen as being the theological fault line that divided Roman Catholicism from the Lutheran and Reformed traditions of Protestantism during the Reformation.
