I grew up evangelical Christian. Even so, we had these books which I found quite interesting. I was about 8 to 10 years old when I read them:

Astronomy Magazine, Dec. 1974 - The Zeta Reticuli Incident
God Drives a Flying Saucer by R. L. Dione -1973
Chariots of the Gods Unsolved Mysteries of the Past by Erich Von Daniken -1974
The Search for Bigfoot (Monster, Myth or Man?) by Peter Byrne - 1976
Project Blue Book edited by Brad Steiger - 1975
The Spaceships of Ezekiel by Josef F. Blumrich - 1974

I’ve read quite a few books over the decades including Genesis Revisited by Zechariah Sitchin - 1990, The Case for Astrology by John B. West - 1991 and many others. I dismissed their content a long time ago but along my journey to being a critical thinking skeptic these broadened my thought sphere from a very young age and I feel helped me to be the well rounded skeptic I am today.

One thing younger folks should realize is that before the internet, information was a lot less readily available. One of my favorites that I found quite illuminating was Watch the Skies! by Curtis Peebles - 1994. The thought process that exploring these subjects helped me develop was an integral part of my path to Atheism. I do not believe in anything that is considered supernatural. Math, science, physics and cosmology provide me with a view of the universe that satisfies my ongoing quest for knowledge and understanding.