For we did not follow cleverly devised myths when we made known to you the power and coming of our Lord Jesus Christ, but we were eyewitnesses of his majesty.
2 Peter 1:16
My faith rests upon the truth and reliability of eyewitness reports of what Jesus said and did. Peter says it emphatically. It's a clear claim to factual, historical faith. He is saying in effect, "Look, we didn't make any of this stuff up. It is all true. I was there. I saw it." People lived and walked with Jesus and faithfully reported the facts about Him.
When I believe the gospel, I can trust it as implicitly as I might trust an eyewitness account. What's more, the New Testament is filled with multiple written accounts, not just one, and they have a remarkable unity and clarity around the gospel: they all point to the life of Christ, to His saving death, burial, and resurrection.
Peter's eyewitness claim is another strengthener of what the scriptures present about Jesus. Reading theses accounts in the gospels plainly, one must conclude that the early Christians taught salvation by Christ alone. Examining the evidence of the New Testament leads to the conclusion that Jesus is both Savior and Lord.