The Sugar Frosted Nutsack by Mark Leyner. Picked it up from the library just for the title, but could not get through it just from how bizarre it was, just in structure alone.
It’s about a whole pantheon of gods and their delight watching the adventures of one middle aged slob. Or, far more likely, about said middle aged slob losing his mind.
Arrival.
The book goes much more into the concepts but the presentation of the aliens is pretty lackluster. The movie is much better at conveying a sense of awe.