I suppose the debate will go on forever. I cannot get beyond the notion that I am responsible, that there exists within me some moral accountability for my choices. If, I have experienced an infusion of grace than surely, I must be obliged, somehow, to honor and participate in this giftedness. Indeed, it would seem if I have been called, if I have seen the light than perhaps, Pelagius may have been right. I am responsible to live the new life that I have been shown. If I falter, the fault is mine not God's.
Pelagius was not right. It is true that we freely cooperate with grace and are judged by our works, but it is also true, contra Pelagius, that grace is the sole engine that makes our choices for the good possible.
Where I would differ with my friend annalex is in saying it is grace only (sola gratia) by which we are saved. That is, only through and by God's total grace do we come to know Him and persevere. We do nothing to cooperate or effect our salvation as much as we would like to think we do.
If you are truly in Christ you will never falter to a point of total rejection simply because Christ will substain you. He is the Shepherd that guard His sheep even from ourselves. For this we praise Him.