So the kids did not get on Facebook or TWITTER and give an account of riding their bikes? Were there witnesses?
The fact we have scriptures presents evidence for examination.
I do not in any way dismiss Scripture, I simply point out that Scripture is a work of human hands, inspired by God but still subject to human error and flaws.
And, again, the New Testament Books rarely if ever reference one another, and the Bible itself never gives it the SOLE authority over faith.
Tradition has its place, and in fact Tradition BROUGHT YOU the Bible.