The New Testament, therefore, was originally composed in the Greek language. Before the invention of the printing press, books were copied by hand, and a handwritten book was known as a manuscript. There are more than 5,000 manuscripts still in existence that contain all or part of the New Testament. Although none of the originals are known to exist, there are some very early copies. The New Testament was written from about A.D. 50 to A.D. 90, and the earliest fragment dates to about A.D. 120.
This may seem like a long time, but it isn't really. The earliest copy of Caesar's The Gallic Wars was made a thousand years after the author penned the work, and the earliest copy of the Odyssey by Homer was made 2,200 years after it was written.
F.F. Bruce observes, The evidence for our New Testament writings is ever so much greater than the evidence for many writings of classical authors, the authenticity of which no one dreams of questioning.
He also states that, if the New Testament were a collection of secular writings, their authenticity would generally be regarded as beyond all doubt.