Morality is a function of faith and belief. Without faith and belief, you can have no morality.
So, if I or someone else leads a life devoid of what you would consider "immoral behaviour" but fail to have a faith in god then that person is "immoral."
Sorry, I dont buy it.
And one who has a faith in god is clearly capable of leading an immoral life. So one is obviously not dependant on the other.