Final answer:
The New Testament is comprised of the Gospels which detail Jesus's life, his divine teachings, and the expansion of early Christianity by his disciples. These texts underpin the Christian faith, portraying Jesus as the Christ, and led to the Bible that includes both the New and Old Testaments.
Step-by-step explanation:
The New Testament documents the life of Jesus, his teachings, and the early spread of Christianity as recounted through the Gospels of Matthew, Mark, Luke, and John.
These texts serve as the foundation for the Christian faith, illustrating Jesus's role as the Messiah - a pivotal concept that derives from Jewish theology.
The Gospels describe Jesus's miraculous birth, his aptitude for spiritual wisdom, his three-year ministry preaching about salvation and forgiveness, and his crucifixion, followed by his resurrection and ascension into heaven.
Jesus's early followers, including the disciples or apostles, played a crucial role in disseminating his message, and over time, their missionary work laid the groundwork for the establishment of Christianity as a major world religion.
It's noteworthy that the initial Christians were Jewish, and with time, converts from paganism expanded the Christian community.
The Christian Bible subsequently came to include both the Hebrew Bible (the Old Testament) and the New Testament.