What you are stating is false.
Lots of Christians (mainly academics/theologians who specialise in New Testament Studies) have long acknowledged that the authors of the gospels made things up to suit their theological agenda and intended readership. The technical term for identifying traditions about Jesus that have been subjected to this process is 'redaction criticism'. The aim is ultimately to identify a core of material that might be regarded as authentic. This whole exercise has been described as 'The Quest for the Historical Jesus'.
One example is the contrast between Jesus's teaching about divorce in Matthew's gospel, where Jesus teaches that a man can divorce his wife if she is unfaithful to him, and Mark's gospel, in which he forbids divorce entirely, teaching that ‘what God has joined together, man must not separate.’ As Mark's gospel mentions women divorcing men, it has been suggested that this gospel was aimed at a Gentile readership, as under Roman Law women did enjoy the right of divorce. Contrastingly, only men could divorce their wives according to Jewish law, which raises the possibility that whoever wrote Matthew's gospel had Jewish readers in mind, and wished to persuade them that Jesus was their promised Messiah. In both instances, whatever Jesus taught about divorce has been manipulated.
Of course, there are those (including Christians themselves) who regard the aforementioned quest as futile, and beyond acknowledging that Jesus existed affirm that the Christ of faith is what really matters.
But anyway, it is pure nonsense to suggest that every word of the Bible is literally true. Again, one further example, this time taken from the Old Testament, can demonstrate this: both the future King David and Elhanan of Jair are described as the slayers of Goliath in the books of Samuel. So it can't be both.
In closing, I should add that were three different endings to Mark's gospel in circulation initially. So the gospel ends with the women fleeing the empty tomb and without any resurrection appearances. These endings were appended at this point, so an explanation is in order as to why they were needed and which (if any) is trustworthy.
Really, I have just skimmed the surface of this topic with what little I have said here.
E.P. Sanders
The Historical Figure of Jesus would be the place to start for anyone who wants to explore the issue of what can reasonably known about Jesus in more depth. As a non-Christian, I was amazed when reading this book to discover just how ruthless Christians themselves have been when it comes to the synoptic gospels and episodes within them that they regard as fictional (for example, this is the line that Sanders takes with the accounts of Jesus being born in Bethlehem in Matthew and Luke).
As for the vexed issue of whether Jesus actually existed in the first place, Maurice Casey is the person to look at:
I blogged a short time ago to alert readers about this book. Maurice Casey was a New Testament scholar and Aramaic specialist. He was also nowhere close to being a …
drmsh.com
An academic who is ‘not serving the interests of any faith’ derides self-serving portrayals of Christ
www.macleans.ca