I believe in the necessity of salvation due to the universal rule of sin in human nature (Isa 64:6; Rom 3:19-23) which separates humanity from God (Isa 59:1-2; Eph 4:18), causes spiritual death (Rom 5:15-16; Col 2:13) and enslaves humanity to evil (Hos 5:4; Rom 7:14-20; 2 Pet 2:13-19).
“From all eternity God determined in [love and] grace to save a great multitude of guilty sinners from every tribe and language and people and nation, and to this end foreknew them and chose them” (Eph 2:4-5; Rom 3:22-24). God accomplished his salvific plan through the life and work of Jesus (John 3:16; 1 Tim 1:15; 1 John 4:9,14).
God made “provision for human wrongdoing, corruption, and guilt, provisionally and typologically through Israel’s Temple and sin offerings, then definitively and gloriously in the gift of Jesus’ once-for-all sufficient and perfect sacrificial death on the cross (Rom. 6:10; 1 Pet. 3:18) in the temple of his human flesh (Heb. 10:11-12).” Thus, the death of Jesus was an atoning sacrifice for the sins of humanity (John 10:11; 1 Cor 15:3; Gal 1:4; 1 Pet 3:18; 1 John 3:16). Jesus bore the punishment for the sins of humanity satisfying God’s justice and removing humanity’s guilt and oppression and reconciling humanity to God (Isa. 53:4-6; 2 Cor. 5:21; Col. 2:14-15).
God calls people out of a state of sin and death to grace and salvation by Christ (1 Cor 1:9; Eph 1:8; 2 Pet 1:10). This call leads to conversion which involves turning to God with repentance and with faith in Jesus’ atoning work on the cross (Luke 24:46-47; John 1:12; Acts 10:43, 20:21). Closely related to conversion is regeneration which involves the Holy Spirit renewing a person’s inner being, creating new life and transformation (John 3:5-8; 2 Cor 5:17; Php 1:6; 1 John 5:1).
Through faith in Jesus, believers are declared righteous before God (Rom 1:17, 3:28, 5:1). The righteousness of Jesus is imputed to believers (Php 3:9). On account of the death and resurrection of Jesus, the demands of the law of God are fulfilled (Rom 8:3-4) and believers are shielded from God’s wrath (Rom 5:9). Believers are adopted into God’s family (Gal 4:4-5; Eph 1:5) where they have access to the Father (Eph 2:18), to the inheritance of Christ (Rom 8:17; 1 Pet 1:4), to the provisions and protection from the Father (Matt 6:31-33), and to the loving discipline from the Father (Heb 12:6).
God continues the work of salvation through the process of sanctification. This process of sanctification is the divine act of making Christians holy (Rom 12:1-3). It brings people’s moral condition into conformity with God’s holiness (Matt 5:48; 1 Pet 1:15-16) and with the legal status started in justification (1 Cor 6:11). Sanctification is accomplished by the ministry of the Holy Spirit (Matt 3:11; Rom 8:13; Rom 15:16; 2 Thes 2:13), but Christians also must strive to work and grow in sanctification (Rom 8:13; Php 2:12-13).
Genuine believers “can neither totally nor finally fall away from the state of grace, but shall certainly persevere therein to the end, and be eternally saved” (John 10:28-29; 1 Pet 1:5,9). All true believers will be glorified. Glorification is the final step in the salvation process. It involves the completion of sanctification, the removal of spiritual defects and the ultimate transformation of the body into a new glorified eternal body (1 Cor 15:38-52; Php 3:20-21; Jude 24; Rev 21:1-2).
 Confession 5: “The Plan of God” in Foundational Documents-Confessional Statement at The Gospel Coalition, https://www.thegospelcoalition.org/about/foundation-documents/#confessional-statement.  “The Atoning Work of Christ” in A Reforming Catholic Confession, https://reformingcatholicconfession.com/.  Chapter X: “Of Effectual Calling,” in The Westminster Confession of Faith, https://reformed.org/documents/wcf_with_ proofs/index.html.  Chapter XVII: “Of the Perseverance of the Saints” in The Westminster Confession of Faith, https://reformed.org/documents/wcf_with_proofs/index.html.