The perfect role model of faith is a sinner who has faith, not a non-sinner who has faith. It is not the perfectly moral person who is our role model for this side of eternity. It is the imperfectly moral, struggling, sinning and repenting and sinning again person who, while in the midst of all that, still has faith.
We should not so quickly judge our Christian leaders, saints, paragons of one sort or another, based finally on objective moral standards which can be so easily be faked and turned to pride and pharisaical haughtiness. And we should not judge each other so quickly for the same reasons. Rather, we should look for faith which, ironically, shows itself most often in response to moral failings than successes.
Humbleness arises from the realization that being sure of faith in oneself is, at best, a difficult and long project, and a near impossibility to be sure of in others. Abraham, sinner though he was, is the father of our faith; King David, sinner though he was, was a man after God’s own heart; St. Peter, denier of Christ himself, was martyred finally for his love of our Savior. We should remind ourselves that faith is a miracle, and act accordingly.
The perfect role model of faith is, in the end, the one who truly has faith — and it takes time to know who that is, often until the end of their lives.
Keep in mind that faith is related, but still something different, than the moral life or the devout life. Some may be very good at being moral examples, living exemplary lives of good conduct and right living. And they are examples of holiness. Hopefully they also have faith. But it is the one who, when faced with their own moral failings or profound sufferings, still cling to God — “Where would we go, you have the words of eternal life.” “Lord, you know everything; you know that I love you.”