The person who speaks most directly about her faith is Jane Fonda, in an interview with DeCurtis (who has written several articles for Beliefnet):
Somebody very hostile said to me, “Have you been saved?” I tap-danced around that, but later I asked a friend of mine who teaches Bible study, “What does that mean?” And she said, “What it meant to me was taking the next step.” Well, that’s all anybody had to say to me — I’m always ready to take the next step [laughs]! So I became a Christian.
And I remain a Christian, but I’m still on a journey to define what that means. I very much feel the presence of God. And then this person Jesus — I am utterly fascinated by this man. I feel that what he preached was revolutionary, and it’s totally what we need now. The most revolutionary statement anyone could make is “Love thy neighbor as thyself.’ Whew, man. If we could live what he taught, everything would change. But it ain’t what goes by the name of Christianity right now.