- The gospels are not eyewitness accounts. Or at least, there is absolutely zero evidence that they are eyewitness accounts. They do not claim to be, and several scriptures (the temptation in the desert, for example) describe Jesus' actions and prayers even though he's purportedly alone.
- Eyewitness accounts tend to fairly unreliable anyway, even in the short term. Considering the gospels weren't written down for many decades (at least 50 years), there was clearly a lot of time for details to become omitted, altered, or added.
- There's no evidence that the gospels were passed on through any sort of oral tradition, at least not in the rigid sense of the oral Torah, an obviously Rabbinic tradition. The gospels don't claim to be the product of any such oral tradition and there's zero independent evidence that they were. It's just something Christians made up.
- The original manuscripts are long lost, which if you think about it seems like kind of a big deal. If the Lord and Creator of the universe had visited Earth and conducted the most important mission of all time, wouldn't the early church have a vested interest in preserving the early manuscripts?
- The gospel manuscripts we do have are riddled with uncorroborated historical claims and contradict each other.
- Some Christians like to pass contradictions off as simple omissions: for example, the contradiction of who was at the tomb. Since the different gospel say different things, Christians claim they create an aggregate account rather than being a contradiction. But, at least in that example, it's a pretty silly claim. One of the gospels claims an angel was present; the others don't even mention it. Wouldn't that be kind of a big deal? Y'know, the sort of thing you don't forget to write down? Face it: it's a bona fide contradiction.
- While many secular historians accept the idea an apocalyptic rabbi fitting Jesus' description did exist, there's absolutely no evidence that the Jesus of the Bible actually existed or that the gospels provide a reliable account of historical events.
Most importantly though, there is absolutely zero evidence, nor any rational reason to believe, that the Bible was "divinely inspired" or that there is anything contained therein which could not have easily been written by the contemporaneous humans. There's absolutely no reason whatsoever to believe that the story of Christ's crucifixion and resurrection actually happened.
Hope you had a wonderful Easter, which of course is one of many holidays that Christians adapted from pagans.