Jesus? Yes! Christianity? No!
How can you be sure that the original message Jesus brought hasn't been tampered with by some well-meaning but deceived individual who wants to promote his own agenda?
Issue 1: The authenticity of the records, including their reliability and purity. Scholars have spent their lives studying this issue, and the deeper they dig, the more convinced they are that the record is trustworthy. More than forty manuscripts of the Gospels exist that are 1,000 years or older, with the finest including both the Old and New Teataments dating between 325 AD and 500 AD.
Issue 2: The moral character of the eyewitnesses. In any court of law, an issue of prime importance is the credibility of the witnesses. A judge wants to know, "Did they have any motive which would have led to distorting the truth?" Matthew was a tax collector. Mark was a young man, a close friend of Peter, in whose home the early church met. Luke was a Syrian physician, and the companion of Paul on some of his missionary journeys. John, the fourth biographer, was probably the youngest of the twelve who were closest to Jesus. On the cross, Jesus asked John to take care of his mother.
Issue 3: Changed lives. These four biographers paid for their faiths in the currency of suffering and a martyr's death with the possible exception of John. Following the resurrection, everywhere they went, they proclaimed what they had seen.
Issue 4: The testimony of archaeology that includes documenting many of the places and events referred to in the Gospels.
Knowing the truth brings assurance that the record is trustworthy and that what Jesus Christ promised is valid. Faith is your response to the truth, and it's the part no one can do but yourself.
"What is truth?" Pilate asked. With this he went out again to the jews and said, "I find no basis for a charge against him." JOHN 18:38