If Jesus wasn't magic, where did the Bible even come from?

Some people wrote it down. That's also the Christian story of where the Bible came from.

There probably was something extra-special about Jesus, in the sense that he was highly charismatic, or persuasive, and so on. And his followers probably really did think that he'd come back from the dead, or at least that his body had mysteriously vanished. But none of that adds up to magic or divinity. Look at people in the current day - convinced (rightly or wrongly) in the existence of aliens, or homeopathy, or whatever else. "If L. Ron Hubbard wasn't magic, where did Dianetics come from?"

Alternatively, consider Joseph Smith. He's far more recent and far better-attested than Jesus, who also had a loyal group of followers who swore blind that they'd seen miracles - even the ones who later broke with him, and who after his death, carried on his teachings and founded a religion with the utmost seriousness and in the face of extreme hardship and sacrifice. Yet chances are you're not a Mormon (or, if you are a Mormon, consider Mohammed ibn Abdullah). Apply the same thinking to Jesus's life as you do to that of Josepth Smith, and see where it takes you.