Christianity, as it came from the mind of God, is clearly set forth in the New Testament.
The four gospel records—Matthew, Mark, Luke, and John—give us the account of the earthly life of Christ and His ministry, including His death for the sins of all mankind and His burial, resurrection, ascension, and promised second coming to receive all of His faithful followers.
The fifth book of the New Testament—Acts of the Apostles—tells of the coming of the Holy Spirit on the apostles of Christ to guide them into all truth (in fulfillment of Jesus’ promise to them before He left earth—see John 14–16), the establishment of the church on the day of Pentecost in Jerusalem, and the expansion of the church, particularly through the labors of the apostle Paul.
The books of Romans through Jude set forth the basis of man’s justification from sin and give divine instructions to Christians as to how they are to live in the light of their redemption, how the church is to be organized, and how it is to function in worship and work. These books also set forth many warnings about false teachers, false doctrines, and a general falling away from the simplicity of the original faith of the gospel.
The last book of the New Testament—Revelation—describes the opposition Christians faced in the early centuries of the church (and, in principle, the challenges they face in all ages) and the ultimate victory of the faithful people of God. —Hugh Fulford