For the same reason nobody believes the superman storage in marvel comics
The term Christian covers a multitude. Some believe the <br />
The only other mention of Jesus in any ancient document is by the Roman historian Tacitus and that's only a mention in passing. Which other documents are you thinking of?
There are any number of other gospels which tell the Jesus story not included in the Bible.
Almost none are contemporaneous with Jesus. The accepted gospels existed in oral tradition before they were written down but the rest were ruled out for being either written nowhere near the time of Jesus or for being just silly. Have you read any of them? Many are unbelievably stupid. Read the Arabic Gospel of the infancy . It's painfully stupid.
Christians consider "The Bible" as the word of God.... Other "stuff" is not considered the gospel... The key word in religion is " believe"....Compare it the internet, there are reliable sites for info... and some that have content that may or may not be accurate...
The bible was written by God and a reliable source of truth.<br />
(John 17:17) 17 Sanctify them by means of the truth; your word is truth.
Because they are christians.
Because an old guy didn't tell them to when they were little.
Such as? Josephus?