No book written by men is free of bias. If it were truly what God wrote, then the entire world would agree with its content, yet we know that is not true as there are many denominations and many faiths. Is it not possible that all might contain a kernel of that eternal truth that must be gleaned through study and understanding?
Only one overall situation has been thus far. A book which contained an accurate overview would not be seen to be accurate by the entire world. People in the world are born essentially ignorant, do not initially have the knowledge and experience necessary to know the truth, are taught and accept incomplete and/or incorrect ideas, etc......
Even a complete lie is based on -and is an inaccurate description of -the truth.
It is true that even a completely accurate quote of the truth from a perfect being would still be heard or read by imperfect beings -and could then be misunderstood -the misunderstanding passed on, etc...
It is also true that humans communicate in imperfect languages built upon incomplete understanding of the universal truth -and so are inherently prone to allowing misunderstanding -and any truth written or spoken in those languages would also be.
God did not actually write the bible -that is true. However, that is not the same as saying some things written in the bible are not direct quotes of truth from God (or others who knew the truth) -who intended that they be written by men, and were expressed to them and written by them in their imperfect languages -and were then subject to misunderstanding, incorrect translation, alteration, etc....
Also -as humans know -much care must be taken in the revealing of facts/truths (when, where, how, to whom at what point, etc.) in order to create the best possible outcome.
Some bible verses on the subject....
Zep 3:9 For then will I turn to the people a pure language, that they may all call upon the name of the LORD, to serve him with one consent.
Isa 28:11 For with stammering lips and another tongue will he speak to this people.
2Th 2:2 That ye be not soon shaken in mind, or be troubled, neither by spirit, nor by word, nor by letter as from us, as that the day of Christ is at hand.
Mar 4:12 That seeing they may see, and not perceive; and hearing they may hear, and not understand; lest at any time they should be converted, and their sins should be forgiven them.