A recent "history" television show made the claim that "we only have four stories about the life of Jesus, all of them decades removed from his day." The host then retorted, "It's like a bunch of people writing about what their grandparents saw back then." General mocking laughter followed.
This is not the case. The facts about the life of Jesus are some of the most well-supported and well-documented of any from the ancient world. Here are some of the lines of evidence supporting the basic fact of His existence.
The account of the life of Jesus is also not limited to his friends and followers. Secular historians, including those hostile to his cause, recorded his life and ministry.
Another important source of data is the prolific writing of several of the early leaders of the Church after the Apostles, collectively called the Apostolic Fathers. Hundreds of manuscripts, very close in space and time to the original events, support the testimony of the gospels and epistles with additional evidence and testimony. No such cascading evidence exists for any other religious figure.
Let's put this into clear numerical focus. Within the 100 years following Pentecost, not only do we have all 29 books of the New Testament written and verified by the church, but we also have the four letters of Polycarp, the three major works of Irenaeus, the epistle of Clement of Rome, the seven epistles of Ignatius of Antioch, the epistle of Barnabas, the Didache, the Shepherd of Hermas, the epistle of Diognetius, the fragments of the writings of Papias of Heirapolis, the Apology of Quadratus, the Apology of Aristides, and the eight writings of Justin Martyr. That survey presents 59 sources pointing to the life and work of Christ written within the first 100 years after his death and resurrection.
To this, add the five secular sources mentioned above, and we have 64 reputable historical documents pointing to the life, ministry, death, and resurrection of Christ in the first 100 years after his life. How does this body of evidence compare with other religious leaders?
There is not a single document about Gautama Buddha written within 200 years of his death. Everything known of him was orally transferred for at least two centuries.
Krishna was purported to live around 3,200 BC, but nothing was written down about him that can be traced to before 400 BC at the oldest, most generous dating.
There are 40 texts that testify to the existence of Mohammed. Twelve of these texts were written by Christians about his political and military activities and by no means assert his status as a prophet. These would be more like the five secular sources mentioned above. The remaining 28 sources written about Mohammed within 100 years of his life are written by Muslims, but they hotly contrast each other, so that very little about his historical life can be solidly established by their testimony beyond broad strokes. This lack of a uniform witness is made all the more meaningful when one considers that we are 635 years closer to Mohammed's story than Christ's.
The most striking counter-example is the collection of early sources around the life and work of Joseph Smith. Smith was the author of the Book of Mormon, which he completed in 1829, less than 200 years ago. The Mormon church just published a book of photographs of the original manuscript of the Book of Mormon, but they only have 28% of it by their own admission. The rest has been destroyed and lost. Also, the Mormon church acknowledges eight official biographies of Joseph Smith, but only three were written in the first 100 years. The poverty of the near-historical record for this young cult is profound.
The early church was launched in earnest in AD 33 on Pentecost, 50 days after the crucifixion of Jesus and his subsequent resurrection. From that original group of 120 followers, 3000 believers were added in one day, and by the end of the first decade of the church, there were conservatively tens of thousands of people following "The Way" of Jesus. These people all lived in a time and place where it was easy to double-check the facts. At any point, counter-witnesses or whistleblowers could have shut the whole thing down. They didn't though.
Quite to the contrary, numerous historical accounts describe the fidelity of early Christians to their belief in the person and work of Jesus Christ in the face of horrendous suffering. Lives were gruesomely forfeited in all manner of torturous deaths, and all that would have been needed to escape that fate would have been to denounce Christ and offer a Pagan sacrifice. Martyr after martyr continued to face the lions rather than break faith with their Lord.
Liars don't do this. Con artists don't die for their tales. People who have met the incarnate God and whose lives have been forever changed do.