Why do gospel contradictions matter?

[Tonus]

For a number of reasons. One, you would expect that god's guidebook for humankind would be a work of wonder so amazing that there would be no doubt of its divine origin, but instead you get a clumsy anthology that wasn't edited very well. Second, if the idea is to establish the truth of certain matters, it helps if the various accounts don't contradict in important details. Third, why are there so few corroborating documents outside of the gospels, most of which either don't seem legitimate or are oddly unimpressed with the realization that god had walked among men. And why would it take that long for people to even begin to write down their memoirs of the time that they PARTIED WITH THE LORD OF THE WHOLE UNIVERSE???

Although the length of time between what happened and when people wrote about it also brings up a curious idea: imagine that this itinerant preacher warned about stuff that would happen in 30-40 years, and none of it happened, so a group of people start writing stories about how he predicted stuff that really did happen? And what if, hundreds of years later as the state religion built upon his memory is gaining traction, they decide that to be relevant those stories have to have a future interpretation as well? Suddenly the dearth of contemporary material and the way that the Bible is assembled into its current form might just have an explanation that seems plausible.