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Christianity is developed with faith, and faith comes with the witnessing of Christ through evangelism. Therefore, the two are processes of assuring the believer's faith through the sharing of the word of God. Matthew 28:19, "Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit",
Christian theology is summarized in various creeds. These professions of faith state that Jesus suffered, died, was buried, descended into hell, and rose from the dead, in order to grant eternal life to those who believe in him and trust in him for the remission of their sins. The creeds further maintain that Jesus bodily ascended into heaven, where he reigns with God the Father in the unity of the Holy Spirit, and that he will return to judge the living and the dead and grant eternal life to his followers. His incarnation, earthly ministry, crucifixion, and resurrection are often referred to as "the gospel", meaning "good news". Hebrew 11:6, "And without faith it is impossible to please God, because anyone who comes to him must believe that he exists and that he rewards those who earnestly seek him".
Faith in Christianity is a central notion taught by Jesus himself in reference to the Good News. In the understanding of Jesus, it was an act of trust and self-abandonment in which people no longer rely on their own strength and policies but commit themselves to the power and guiding word of him in whom they believe, which is Christ our Saviour. John 14:6 Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me".
John 6:28-29, "Then they asked him, “What must we do to do the works God requires, Jesus answered, “The work of God is this: to believe in the one he has sent”.