God is the perfect and all-powerful creator and sustainer of the world. He has always existed and will always exist in an equal and harmonious community of three persons in one essence: Father, Son and Holy Spirit (Matthew 28:19; John 15:26).
God the Father is the Father of Jesus, his only Son, and the spiritual Father of all who believe in Jesus (John 20:17). He is the creator, sustainer and ruler of the universe (Hebrews 11:3; Nehemiah 9:6; Psalm 103:19).
God’s only Son is Jesus (John 1:14). He became a man through a virgin birth, miraculously uniting his divinity with his humanity (Matthew 1:18-25). He lived on earth for 33 years, was crucified on a cross (a form of capital punishment used by the Romans), and came back to life three days after he died (1 Corinthians 15:3–6). He now sits at God’s right hand and is waiting to come back to judge and rule the world (1 Peter 3:22).
The Holy Spirit proceeds from the Father and the Son. Since Pentecost (described in the Bible in Acts 2), he primarily convicts people of their sin to restrain the effects of evil, bears witness to the truth, brings new life to those who repent of their sins and trust in Jesus, leads and comforts God’s children, and empowers God’s children to live rightly (John 16:7-15; Galatians 5:22-23).
God created human beings in his image with the power and responsibility to choose between loving and obeying him or rejecting and disobeying him. He intended us to choose him, but ever since Adam and Eve voluntarily disobeyed God in the Garden of Eden, we have all been born with an evil disposition. We consistently reject, disobey and betray God and are justly condemned for our actions (Genesis 1:27; Romans 3:10-12, 23).
Because he loves us, God sent Jesus to voluntarily die as a perfect sacrifice for our sins. He experienced the full condemnation that we deserve for our sin. When we admit our sin, turn from it, and trust that we are saved through Jesus’ life, death and resurrection, we are no longer condemned or separated from God. We are also able to stop sinning by the power of the Holy Spirit who lives in us. God promises we will never again be separated from him (John 14:6; Acts 2:21; Colossians 2:11-15).
We are all immortal, which means we will live forever. Those who trust in Jesus will live forever with God in a new heaven and earth unstained by sin after Jesus returns (1 John 3:2). Those who don’t trust Jesus will live forever separated from God and experience the full condemnation that we deserve for our sin (Revelation 21:1-8).