The God Delusion.
The Age of Reason.
God is not Great .
A Short History of Nearly Everything.

A Brief History of Time, by Stephen Hawking.
Pale Blue Dot: A Vision of the Human Future in Space, by Carl Sagan.
Death by black hole by, Dr. Neil Degrasse Tyson.
There have been many more, but these three are the ones that I've re-read the most. I get something more each time I read them.

1. The Age Of Reason, by Thomas Paine
2. Biography of Thomas Jefferson

God: A Human History by Reza Aslan

Evicted: Poverty and Profit in the America City by Desmond Matthew

Being Mortal: Medicine and What Matters by Atul Gawande

Sapiens: A Brief History of Humankind by Yuval Noah Harari

The Sixth Extinction: An Unnatural History by Elizabeth Kolbert

Bait and Switch: The (Futile) Pursuit of the American Dream
Living with a Wild God: A Nonbeliever's Search for the Truth about Everything
Nickel and Dimed: On (Not) Getting By In America All by Barbara Ehrenreich

We Are Our Brains from the Womb to Alzheimers by Dick Swaab

The New Jim Crow: Mass Incarceration in The Age of Colorblindness by Michelle Alexander.

May seem a bit silly but I read Mists of Avalon years ago, and although it is fiction it made me start to realize how competitive religions were in controlling world views. I started to question mine. I grieved when I finished the book.

Surprising that no one has said this, but the Bible opened my eyes to the world in ways my pastor never intended.
From it I learned the lies, deception, hate, fear, abuse and uselessness of religion.
Reading my bible was the worst thing I could’ve done as a religious person.

Non-fiction..

Rights of Man by Thomas Paine.
Cosmos by Carl Sagan.
War is a Racket by Smedley Butler.

God is Not Great.

“The Science of Discworld” V1-4 by Sir Terry Pratchett (STP). Covered human history, science, literature, and religion better than any other text I know of. With the possible exception of “Systemantics” by Gall. It explains systems somewhat more succinctly than TSOD, But not by much.

Robert Heinlein ...Stranger in a Strange Land

The Grapes of Wrath.

Wow, this is like asking me about my favorite glass of water. I cannot narrow it down well but I will say that "On the Origin of Species" by Darwin was great AND it sparked a revolution of countless other great books.

At the risk of dating myself a good place for me to start would be 1984, heart of darkness,catch 22. Books like that.

Marcus Aurelius Meditations

The God Delusion
Cosmos
God Is Not Great
The Brothers Karamazov

Book: Fahrenheit 451

Comic book: V For Vendetta

I've always been fascinated about stories of totalitarian regimes and the societal effects brought with. The wondering how people could allow it, how even with so much history we can easily forget and repeat.

I Ching Wilhelm/Baynes version

Catch-22 and Guns, Germs, and Steel

When I was younger it was books like Uncle Tom's Cabin, Little Women and the classics. Then in middle school I read The Third Reich and The Diary of Anne Frank. Lately it's been books by Wamariya (The Girl With The Glass Bead Smile), Jasmyn Ward (Sing Unburied Sing), Salman Rushdie, Margaret Atwood and Haruki Murakami. I particularly like non-American authors for their perspective on the world outside of our myopic view.

Ayn Rand's "Atlas Shrugged."

Stranger in a Strange Land....Rabbit Run...The Plot Against America.

Hands down for me: Atlas Shrugged. Period.

All is Quiet on the Western Front , Erich Maria Remarque. I read it as a teenager, had to take it out of the library under the pretense that my father wanted to read it.

there have been so many, so VERY many. i don't think one book changed my WHOLE world view, but many books changed many parts of it. a spaniard in the works and in his own write changed my view of writing itself, which is important as i am a writer. stranger in a strange land was seminal. if i listed them all the computer would explode.

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Most of the ones I've read. Though learning about the Kardashev Scale via Michio Kaku has influenced me. Also Kahlil Gibrans many books. And the sensitive dependence on initial conditions thought process from Chaos is a big one that helps. Though I am fond of Alyosha The Pot too.