Christianity is a way of life based upon the teachings of Jesus. Jesus is the Christ. The word "Christ" means anointed one. Jesus is the anointed one from God the Father who came to this world, fulfilled the Old Testament laws and prophecies, died on the cross, and rose from the dead physically. He is divine in nature as well as human. Christianity teaches that there is only one God in all existence, that God made the universe.
God created Adam and Eve and put them in the Garden of Eden and gave them the freedom to choose between right and wrong. They chose to sin. Sin is doing that which is contrary to the nature and will of God. The sin of disobeying God that Adam and Eve committed resulted in them being expelled from the Garden of Eden as well as suffering the effect of sin. As a result of their sin, their children and all of us inherited a sinful nature.
Christianity teaches that God is triune, manifesting himself to us as Father, Son, and Holy Spirit, not three Gods, that Jesus Christ is the second person of the Trinity, that Jesus died on the cross and rose from the dead physically. It teaches that Jesus is the only way to be saved from sin and that salvation is by grace. This means that we are not made right before God by our efforts, sincerity, or works. Instead, we are made right before God by faith in what Christ did on the cross.
Christianity further teaches that once a person is "born again" (becomes saved) the Holy Spirit lives in that person and the person is changed: "Therefore if any man is in Christ, he is a new creature; the old things passed away; behold, new things have come," (2 Corinthians. 5:17). This means that God actually lives in the person and the Christian then experiences a true and living relationship with God.
Therefore, Christianity is not a religion but a relationship with the true and living God through the person of Jesus Christ by whom we are forgiven of our sins and escape the righteous judgment of God.
What is Christianity?