05/04/2016 6:13 AM AEST | Updated 05/04/2016 6:58 AM AEST

16 Children's Books For 'Spiritual But Not Religious' Families

And kids with big questions.

Amazon / Huffington Post

While a growing number of Americans are forsaking traditional religious identities, they're still asking the big questions: What is God? How do I make meaning in my life? What is the purpose of it all?

In fact, although the religiously unaffiliated are now the second-largest religious demographic in the country, Americans' level of spirituality seems to be on the rise. According to Pew Research Center surveys conducted in 2007 and 2014, more people in recent years are reporting feelings of wonder about the universe and spiritual peace and well-being. Among those who identify as "spiritual but not religious," about 67 percent are "absolutely certain" that God exists.

The growth of the unaffiliated is largely driven by the Millennial generation. As this group ages and begins to have kids, Millennial parents will certainly be searching for ways to pass their expansive spirituality to their children.

With that in mind, HuffPost Religion put together this book list for "spiritual but not religious" families who want their kids to look at the universe (and at the possibility of God) with plenty of awe and wonder. Most are books that describe a general sense of spirituality. Some refer to a specific religious tradition in a way that is accessible to people of all faiths. Other books celebrate the values that unite all faiths -- being kind to your neighbor, loving boundlessly, and treating people who are different with respect.

Scroll down for a list that includes books for a variety of ages -- from young children to adolescents -- and add your own favorites to the comments below.

Photo gallery 26 Books Every 'Spiritual But Not Religious' Seeker Should Read See Gallery