The veracity of the Bible as a historical document has been debated and proven time and again.
First, take for example other historical figures Caesar, Plato, Tacitus. There is no question these people exist. The number of historical manuscripts between the three of them number less than 60. In comparison, the number of biblical transcripts and fragments from the time of the apostles numbers over 10,000. Jesus existed.
Second, the apostles who wrote those documents had first hand encounters with Jesus (except Mark), and when you compare their accounts with one another from a documentary evidence standard of proof overwhelmingly confirms they were not lying, as the authors who wrote them were in different countries, without the benefit of any technology. Remember, a scribe was the computer of that era. Many people who have studied this to disprove the gospel have ended up followers of Christ... Like Lee Strobel, who intended to dissuade his wife's faith, and ended up writing a book to convince others.
Last, the proof is in the following. Psalm 34:8 says taste and see that the Lord is good. It doesn't say give God blind faith and He might do something nice for you. It's more along the lines of give Him a chance and He won't let you down, no matter who you are, what you've done, where you came from, or what happened to you. He will bless even the smallest step of faith because that's who He is. Eventually, someone who takes this small step will realize they aren't in control of the mistakes they make that don't line up with God's plan, wisdom, teachings and commandments... Like I did, and every other practicing Christian. We come to the end of ourselves unable to live out the good instruction Jesus gave us, and we humble ourselves, admit our mistakes, and then miracles happen where He forgives us and makes us new, healing the broken parts of our character and blessing us with the ability to be good in ways that we previously weren't. That doesn't mean we're perfect. It means we're working on it. And He tells us to be peculiar. Peculiar like a conservative guy from Kansas going into a liberal UK women's site and engaging in dialogue. I'm still a mess for sure. And I'm not perfect, but I know someone who is. And I want more people to know that about Him because it's true and He instructs me to tell others.