Dexter: differences between the books and the TV show (open spoilers)

Ok I’m currrently about 60% through Dexter by Design (book 4). I have to say that book 3 was pretty bad with all the BS about Moloch and stuff. I can’t tell how good book 4 is yet. Deb just woke up in the hospital. I can’t tell where it’s going. I probably won’t have an opinion on it until the end.

What I’m confused by is that stupid Moloch crap from book 4. Is the implication that everyone who has a “dark passenger” or as the kids call it, a “shadow” harboring one of Moloch’s “children”? Or is there some other force at work in other serial killers? Dexter still says that he knows how they think because he is like them, and seems to get insight from his “dark passenger” about other killers, so it makes it sound like there is something in common… but that would mean that this “Moloch” god-thing had lots and lots of these children, and that they go into anyone who has a traumatic childhood event happen.

Does the author explain this any better later on? If not, in your opinion, is the author suggesting that all killers (serial killers) have a “Moloch” offspring in them? Do Cody and Astor have one? Cody claims to have a “shadow”…

I really wish the author hadn’t added the whole Moloch storyline. It takes away from the novels, rather than adding to them.

And am I right that there are only two more books after book 4?