Although not a Baháʼí herself, she became an active friend of the Baháʼí Faith and has appeared at concerts, conferences and conventions of that religion. In 1992, she appeared in the musical event prelude to the Baháʼí World Congress, a double concert "Live Unity: The Sound of the World" in 1992 with video broadcast and documentary. In the video documentary of the event Sainte-Marie is seen on the "Dini Petty Show" explaining the Baháʼí teaching of progressive revelation. She also appears in the 1985 video "Mona With The Children" by Douglas John Cameron. However, while she supports a universal sense of religion, she does not subscribe to any particular religion.