Deuteronomy 34

some people have had a problem with this chapter, because it's about the death of Moses, and since Moses obviously couldn't have written about his own death, this book and therefore the whole bible is untrustworthy.

This ignores three points. First, as far as I know, these five never claim to be solely by Moses. Second, there's no reason God couldn't have revealed the future, including the death of Moses, just as easily as he did the past. Third, there is good evidence that someone edited these books later, and there's no reason to think this editor wasn't inspired too.

You can always find a reason to disbelieve if that's what you're after.