There have been thousands of ancient manuscripts found all over the place, which agree with the current Bible almost character by character in the original languages.

To corrupt all of them, and all the ones yet to be found, some super powerful and super smart people would have had to find all those manuscripts first, make undetectable modifications, and then replace them so that no one could tell they'd been retrieved before.

And the New Testament was written by people who actually new Jesus. They died rather than recant what they had seen and heard.

There is extremely strong evidence that everything in the Bible, cover to cover, is true. I have only found one minor error in a man's age in one of the books of Chronicles that has been repeated without change from the original Hebrew. Yes, I have read the entire Bible cover to cover, even proofreading it. One of my copies has a single letter wrong, and I stuck a PostIt note on that page.

Do you know how the Bible was copied thousands of years ago? It was a tedious process that involved looking at a character in the original, saying it aloud, looking at the place for that character on the copy, then perhaps going back to the original yet again, saying it aloud, returning to the copy, carefully stroke by stroke copying the character from the original, then say it aloud, compare it with the original, say it aloud, etc., etc. So errors of even a single character were extremely rare. Much rarer than typos in modern books.