Confused

So the other day I was strolling through the bookstore when it hit me like a mack truck running over a dead snake for the hundredth time, how can all of these people write books? I mean which one should I pick, and if I do decide to pick one, what gave that person the authority or should I say the expertise that they were qualified to write a book. What do they know that I don't? I feel like if you write a book on something, you must be pretty knowledgable about the subject. So how come when I see books titled "How Would Jesus Vote," or the many " What God Desires For You" books, it has suddenly turned me off. Don't get me wrong I love to read Christian literature all day long, but I can no longer read books like this. I don't feel like these books get me anywhere anymore, not because I'm so far advanced in my reading, but I need to hear something new and fresh. When I see the titles as I pace through the store with my indecisiveness, it frustrates me to think that these people have some kind of inside edge on God that I don't. I mean how do they know what God desires for me, or how do they know how Jesus would vote? If you have been to the bookstore lately, check out the covers of the books, they have gotten to be so creative that even a book that might not even be good will be purchased simply for the artistic creativity of the cover. Sometimes I feel like it is all a game, and the only people that are winning are the people that are writing them. However, I am still an avid reader and more than just a casual fan when it comes to Christian literature, but I must say that these things do disturb me.