I just finished a great book, Fantasy Land, by Kurt Anderson, it ties together the link between people’s belief in superstition and magical religion to their willingness to accept other nonsense, reject science and helped create our "alternate fact" reality we currently find ourselves in.

[amazon.com]

Hola

I think anything by Seth Andrews is good.

Besides those already mentioned, here are some others:
"Coming Out Atheist" by Greta Christina
"Fighting God" by David Silverman
"The Secular Activist" by Dan Arel
"NonBeliever Nation" by David Niose
"Living the Secular Life" by Phil Zuckerman

I would read, Richard Dawkins, Christopher Hitchens, And Sam Harris. Read "God is Red" by Vine Deloria, a native American. Read "Why I am Not a Christian" by Bertrand Russell. I would seriously watch the youtube videos, of George Carlin and Lewis Black on religion or creationism, Absolutely stunningly brilliant assessments of religion, IMO. Watch the movie, The Life Of Brian by Monty Python. Watch the movie Runaway Train by Andrei Konchalovsky.
Ingersoll:Immortal Infidel is another good one about Robert Ingersoll.

Anything by Dan Barker or Christopher Hitchens. Some of the other authors get pretty dry, so save them for later. The one book that really clinched for me that I needed to speak out against religion, though, was the Bible.

Anything by Voltaire

God Is Not Great: How Religion Poisons Everything ~ Christopher Hitchens

That is all.

[amazon.com]

Michael Schermer's Why People Believe Weird Things, The Science of Good and Evil, Sam Harris' The End of Faith, Thomas Paine's Age of Reason, and Reza Aslan's Zealot: The Life and Times of Jesus of Nazareth. You might also enjoy looking up the YouTube video of Richard Dawson reads love letters.