Good place to start Carl! Thanks for the input... It occurred to me to ask you how similar are the words "image of God" and "God speaks words"... I know for me "image of God" may have a symbolic meaning as well as the words "God speaks words". Maybe it could be that in that mystical experience say in Moses the words come through in Hebrew because that was the language of Moses. Well anyway I pose it to you... Thanks again for your post Carl!
There are various reasons as people grasp at meaning and purpose and significance in life.
The religions of China tend to promote harmony
The religions of India tend to avoid pain
The religious of the middle east tend to grapple with the question of God Himself
If a scripture is from God Himself then one would need signs that the scripture is from a God who would act for the fame of His name in writing the book, some signs of that such as quality, good fruit in the lives of followers, signs and wonders possibly in initiating parts, a literary style fitting of such to name a few.
see Climbing the mountain of God with help from the short Psalms
As for the Bible? All the parts of the Old Testament had to be written by a recognized prophet or endorsed by him. As for the New Testament all the part had to be written or endorsed by an apostle and both were kicked off by signs and wonders and miracles with eyewitnesses
But in the end how do you know honey tastes good? you put it on your tongue. Taste and see that the Lord is good.