When the world looks at Christians who say the words written about Noah’s Flood in the Bible do not really mean what they say, then it can be logically said that if the Bible doesn’t mean what it says, why believe any of it? How are we supposed to know which parts mean what is written, and which parts do not?
Jesus Christ the Word says in Matthew 24 that the world will be in a sickenly wanton condition when he returns to redeem Israel and edify the church (his body), the world in a condition like as in the days of Noah when Elohim dealt with the rampant violence and perversion before the flood, so if Noah’s Flood did not serve that purpose, then why believe the stated purpose in the book of the Revelation (to John) of Jesus Christ, the last book of the Bible?
But there’s no need to doubt any of the Bible, for both ends of it and everything in between are real history, the last events yet to be seen, but sure to follow, as prophecy has always manifested. See the big picture of ancient history here http://genesisveracityfoundation.com, the science of the future, old school man.