The following quote comes from the blog Lehi’s Library:
“So in our view it doesn’t matter one bit that a person sinned at some point in their existence prior to becoming a god. It doesn’t preclude the possibility of being divine, because atonement can be made and the sin can be totally eradicated. In this sense I think we have a much more robust doctrine of atonement than mainstream Christianity. Our view of atonement is powerful enough to make gods out of sinners, theirs isn’t. . . . It doesn’t frustrate our sense of existence to speculate that God the Father was once like us.”
I wish all Mormons were that candid.