Ah, it's that kind of statements again. Well, can't help it.
First of all, what did you expect? Them printing, "This book contains the use of figurative language, metaphors, and similes. Please read this artistic book with care," on the book cover? After all, you're only seeing the building from one side of a wall. Let's make an example.
"Lust is harmful," is said to be true words of God. Lust is harmful. It's true. Then, what do you think God is? Some sort of invisible being living up in the sky? Has it ever crossed in your mind that what they mean with God here is a figurative expression? Could it be an expression of that ultimate force in our heart that makes us feel which is right and wrong? Could it be something that we call humanity? It's divine. It's pure. It's holy. What is hell? It's described in a such dreadful way. Could it be the feeling of intense guilt we get from doing wrong things?
I guess you interpret, "True words of God," as literal words said by some kind of supernatural being. You even misunderstand that part, so stop thinking that religions are stupid.
People are forgetting the main purpose of religions. They're there to guide your moral. That's all. They're not trying to fill your head with fantasies like you think they are. All the metaphors were used to give you a better view about it, because you can't describe abstract things like feelings. People also loved art, and they respected the idea of goodness they were following, so it's very normal to them to write it in a such beautiful way.
When you see something that doesn't make sense, try to understand it again. It's very likely that you just don't get it.