It's either all the word of God or it's not. If it's not, why take any of it seriously? If you get to just pick and choose, you can make up any doctrine.
NO .. it is not black and white as you say ... Not at all .. I can prove that not all Scripture is God Breathed .. and not simply on the basis that some global flood killing all Land Creatures sans Noah and kin didn't happen round 2100-2300 BC .. but simply on the basis that if we compare Two Bible versions of the same passage .. say and Older Bible such as the LXX Septuagint - and a modern Translation - they will say something completely different.
We are then tasked with the uncomfortable .. "Which is the Word of God ?"
Much of the Bible is narrative and not even meant to be the word of God .. .. David sent so many troops out .. read Maccaabes sometime - Straight up history .. Ptolomy married Cleopatra .. Xerxes of Persia .. and so on .. narrating real historical events that happened.
The NT - good grief .. whole books were thrown out of the original .. Shepherd of Hermes .. Epistle of Barnabus -- are these no longer the word of God ?
Martin Luther claimed that James should not be part of canon because it disagreed with his sola fide perspective.
The hands of men are all over the Bible ..which is part of the reason no self respecting theologian accepts literalism - and for a host of other reasons .. some of the bible was meant as allegory .. a story that is supposed to convey a message .. the underlying story not necessarily being true..
Say for example in the distant past .. in Genesis times .... someone penned a few details about the common creation narrative that everyone held... Was not just the Israelites that had a flood story in their past .. was everyone .. every culture had the same narrative .. and in the near east .. All recognized the God of Abraham as the Most High .. although they - including the Israelites - also believed in other Gods.
So the roots of the Genesis story go way way back .. so supposed someone penning the story was writing in allegory .. a story that had some basis in fact .. but was really trying to send a message about God .. and the people of the day all realized this .. or they just may have believed that the flood was Global . When the black sea was formed .. that could have flooded a huge region in the near east .. way bigger than the black sea itself .. as it was a geological dam breaking .. after 1000s of years of sea level rising due to ice melt.
but -- I have digressed too far. The God of Abraham was El -- and this was the Most High to the entire Near Easth .. The Father - The Creator - the one who sent the Flood .. the one who dwells in the Mountain ..
They all knew .. and believed the same story.
So there was a massive flood .. one which wiped out allcivilization as these people knew it... We folks in China affected .. well.. Yes .. but in different ways at different times .. rising sea levels over 7000 years affect different areas different ways .. But folks living round 5000 BC when this event actually happened (as opposed to the Bible account which is round 2200BC if taken literally) - didn't know the Chinese people existed... the whole world was destroyed sfar as they could tell .. No many folks with big boats that they could fit some livestock onto either..
Do I have to believe that God teleported 2 Spectacled bears from South Africa - Polar Bears from the Arctic - Kangaroos from Australia to believe my version of the story ... Nope .. but you do.. You also have to believe that either God or Satan came after the fact and planted all the geological, archaeological, and historical "Proof" - to the contrary - unless one is able to completely throw out any semblance of logic and reason .. in which case - God still becomes the author of idiocy - which I personally do not believe he is.
but now to the scripture promised. Open your Bible to Deut 32:43 and tell me what it says.