If God wrote the Bible, why do we give the human authors the credit?

This is how God works. I see it like a mother making cookies. Her young child so badly wants to help. So, even though Mom could do it much more quickly and with much less mess if she worked alone, she gladly accepts her child’s help. Then when the cookies are done and Daddy comes home from work, Mom proudly displays the cookies and says, “Look at what little Susie made for you today,” taking none of the credit for herself.

God uses His people to carry out His tasks—not because He needs us, not because we do such a great job—because He knows that we are blessed by being used by Him. It is clear that none of the writers of Scripture could have conjured up the writings without God’s inspiring them.

"And this voice which came from heaven we heard, when we were with him in the holy mount. We have also a more sure word of prophecy; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts: knowing this first, that no prophecy of the scripture is of any private interpretation. For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost" (II Peter 1:18-21).