Atheism doesn't answer
There are questions that atheism doesn't answer.
Born and raised a Methodist, but not a good Methodist. From my early teens I had questions about the bible that got me yelled at, even cursed at. Paul was summoned to Jerusalem by James on charges of teaching contrary to scriptures and a close or even not very close reading of Paul's writings shows his near constant twisting and even full reversal of scriptures. Christians will not address this honestly. Paul said that the 'Law' was made a curse and done away with - the eternal, righteous, perfect word of God. Paul is clearly the ultimate authority of the Christian NT, even over Jesus because Paul twisted and reversed even the 'holy' words of Jesus. Christianity really should be called Paulianity, and in fact, there are many who do!
I then studied the history of the NT. So many re-edits made by…


"[H]ow could they have known?" The Bible says a lot of things, and a broken clock tells the correct time twice a day. You already admit that "[p]retty much all of the rest of the bible, the OT and the NT are clearly make believe and outright mythology." If 90% of the assertions of a book are unimpressive although 10% of the assertions of that same book are impressive, the book is not impressive overall.