What is Christianity?
by Matt Slick ( excerpt)
Christianity is a religion based on the teachings and miracles of Jesus. Jesus is the Christ. The word "christ" means anointed one. Christ is not Jesus' last name. 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 performed many miracles, which were recorded in the Gospels by the eyewitnesses. He is divine in nature as well as human.
Christianity teaches that God is a Trinity (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, and that all people are under the righteous judgement of God because all people have sinned against God. It teaches that Jesus is the only way to be saved from the coming judgement of God and that salvation is received by faith in the work of Christ on the cross and not by anything that we can do to please God.
Where all other religions in the world teach that we must do some sort of good in co-operation with God in order to achieve the right to be in God's presence, Christianity is the only religion that teaches salvation 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.