I believe that the reason for this is that most people don't know anything else the Bible says apart from these stories, nor do they know how these stories relate to each other or to their lives.
Well, the primary reason is "sin" -- very simply. It's always been that and will continue to be that reason. It's not the lack of knowledge.
I mean, Satan himself, is not lacking knowledge, but he is certainly the father of sin, as sin was found in him and is described as first occuring in him. It's not Satan's lack of knowledge which causes him to do what he has done, but rather, sin in him -- that causes his actions.
And likewise, he imparts that to the human race, so that even if they were to have ultimate knowledge, they would still have sin, and thus would still reject God and have that sort of "disconnect" that is exemplified by that phrase in that article -- "unmistakable gap between belief and behavior". Sin is the cause for that gap...
Regards,
Star Traveler
My people are destroyed for lack of knowledge
Because you have rejected knowledge,
I also will reject you from being My priest
Since you have forgotten the law of your God,
I also will forget your children.
The more they multiplied, the more they sinned against Me;
I will change their glory into shame.
They feed on the sin of My people
And direct their desire toward their iniquity.- Hos 4:6-8