There are no quotation marks to differentiate speech from the rest of the text and sometimes punctuation is omitted how does this style reflect the atmosphere and themes of the book

Cormac McCarthy strips down his language to the bare essentials of grammar to represent the emptiness of his setting. His narrative is often broken and stark to illustrate the broken world the man and boy must inhabit. This style of narrative is not for the amateur writer. McCarthy turns his narrative into prose by injecting his sparse language with emotion that is both subtle and electric at the same time. His "broken" prose and lack of quotation marks turns into thoughts of the soul that transcend the communication found in more structured narratives.

What question? Because now all i can answer with is dumbass lol.