There are no writings - biblical, or non-biblical that are contemporaneous, eyewitness accounts of Jesus. Everything we know about him was written decades later.
If any of us was asked to write a story about some things we did with our friends 30 years ago, how accurate would it be? What if someone else wrote it for us after they had heard it from someone else?
Yes, there are some positive statements and wisdom in the NT, just like there are in other ancient books. Looking at it critically, its not much to go on if you are going to base your entire beliefs and those of your children on it though.