This week on "Up Close," religions and beliefs don't exist in a vacuum, and they change over time as influences go back and forth.

The yoga tradition is presented popularly as ancient wisdom in classes around America today, but most of what's being taught is less than a hundred years old. The woman largely responsible for making your yoga class what it is, and as popular as it is, is the subject of "The Nation" Senior Contributing Writer Michelle Goldberg's "The Goddess Pose: The Audacious Life of Indra Devi, the Woman Who Helped Bring Yoga to the West."

And with the mix of religions here in the United States, it can sometimes feel like we're building a distinctly American religion. One way that manifests is with those who belong to multiple religions at once. Susan Katz Miller discusses that journey in "Being Both: Embracing Two Religions in One Interfaith Family."