We are all sinners. Even those we remember as saints were themselves acutely conscious of their own sin - Francis of Assisi would be a good example - in the sense of separation from God, rather than as ones transgressing some list of "naughty things". Our innate tendency to turn from the presence of God into our own private obsessions and insecurities, sometimes called original sin, is something we all hold in common, from the most obviously "religious" to the least, from those whom the world would regard as good, to those it would regard as beneath contempt.
We live, though, in the mercy that is Christ, all of us. "For in him all things were created: things in heaven and on earth, visible and invisible, whether thrones or powers or rulers or authorities; all things have been created through him and for him. He is before all things, and in him all things hold together." (Colossians 1:16-17 NIV)
In our accepting this solidarity, as it were, with the least of our fellow creatures, as well as the greatest, we are accepting for ourselves also their suffering, their alienation, their grief. Craig Barnett writes:
The religious path is often presented as a way to achieve inner peace and happiness, and to avoid suffering. Much popular spirituality claims that life is meant to be filled with peace and contentment; that pain and anguish are problems that can be overcome by the right attitude or technique. The promise of perfect contentment is seductive, but it can never be fulfilled, because it is based on the illusion that suffering is a mistake.
Suffering, ageing, sickness and loss are not regrettable failures to realise our true nature. They are inherent in the nature of embodied human life and our often-incompatible needs and desires. Any spirituality, therapy or ideology that promises an escape from these limitations neglects the truth that suffering is an essential dimension of human life. Growth in spiritual maturity does not mean escaping or transcending these experiences, but becoming more able to accept and learn from them; to receive the painful gifts that they have to offer.
Our prayer for mercy is answered always by love (Luke 18:9ff), and it is in this love that we, somehow, become as it were aerials for the Spirit, receiving stations for a grace that we may not even ourselves understand.