Well you need to reexamine your logic then. I read the book not the author.
"Just" a book means you hold books in low esteem.
How about examining your logic, then? Interesting to think that a book can write itself and be author-less. That's the only way you aren't reading an author's work.
Shall we have a look at "why idolise those who put letters on paper"? For a start, no-one was talking about idolising. Secondly, exactly the same logic applies to all art: Leonardo da Vinci........pah, it's only painting. Why idolise someone who puts paint on canvas? All architecture can be dismissed just as crassly. Music is just someone making the air vibrate. Mozart? All he did was make noise......
How about sport? All Bob Beamon did was jump. Don Bradman.......nothing to it: hit a ball with a stick. Alan Knott: all he had to do was catch.
What your lack of logic fails to cope with is the concept of quality. We aren't talking about someone who just sticks words down on paper: we're talking about someone who does it so well that many millions of people want to read those words. I'll bet you can sing. Can you get millions of people to pay to hear you do it? Is there anything at all that you do which is good enough that millions of people want to see, hear, experience the product/ outcome? No, thought not. Now, are you starting to grasp the concept of quality? If not, get hold of a copy of "Zen and the Art of Motorcycle Maintenance" by Bob Pirsig, and read a whole book about the idea of quality. Oh, and that sold a few copies too, because he wasn't just some guy randomly putting a few words down on paper.
Having had a chance to re-think, have you got anything intelligent to say about Gabriel Garcia Marquez?