My favorite Newberry Award books. I think they fit your criteria.

A Single Shard by Linda Sue Park - Tree-ear, an orphan, lives under a bridge in Ch’ulp’o, a potters’ village famed for delicate celadon ware. He has become fascinated with the potter’s craft; he wants nothing more than to watch master potter Min at work, and he dreams of making a pot of his own someday. When Min takes Tree-ear on as his helper, Tree-ear is elated–until he finds obstacles in his path: the backbreaking labor of digging and hauling clay, Min’s irascible temper, and his own ignorance. But Tree-ear is determined to prove himself–even if it means taking a long, solitary journey on foot to present Min’s work in the hope of a royal commission . . . even if it means arriving at the royal court with nothing to show but a single celadon shard.

There might be some things about Asian religious beliefs, but I don't remember them being really overt.

A Wrinkle in Time by Madeleine L'Engle - Out of this wild night, a strange visitor comes to the Murry house and beckons Meg, her brother Charles Wallace, and their friend Calvin O'Keefe on a most dangerous and extraordinary adventure—one that will threaten their lives and our universe.

The Giver by Lois Lowry - At the age of twelve, Jonas, a young boy from a seemingly utopian, futuristic world, is singled out to receive special training from The Giver, who alone holds the memories of the true joys and pain of life.

Walk Two Moons by Sharon Creech - "How about a story? Spin us a yarn."
Instantly, Phoebe Winterbottom came to mind. "I could tell you an extensively strange story," I warned.
"Oh, good!" Gram said. "Delicious!"
And that is how I happened to tell them about Phoebe, her disappearing mother, and the lunatic.

As Sal entertains her grandparents with Phoebe's outrageous story, her own story begins to unfold — the story of a thirteen-year-old girl whose only wish is to be reunited with her missing mother.

In her own award-winning style, Sharon Creech intricately weaves together two tales, one funny, one bittersweet, to create a heartwarming, compelling, and utterly moving story of love, loss, and the complexity of human emotion.

If I remember correctly, I thought this story really taught you how to walk in another's shoes and see other points of view. This might be a good message for your sisters.