Fonda has never become a Christian. I watched some of Russert's interview with her for her book tour, and she makes it clear she's a universalist. She belives that anyone, Muslim, Hindu, Jew, or Christian, whover has a strong belief, makes it to this place that she refers to as some bizarre oneness with nature and everything place.
Her belief is downright strange, and has zero correlation to Christianity. So, don't buy into the flase rumor or claim that she's a Christian. She ain't.