It is right to speak of Christmas as a Feast of God’s mercy.
Do not be fooled to think that the joy of Christmas precludes awareness of sin.
But that awareness comes in a way we never thought of. Our examination of conscience in association with the Sacrament of Penance does not primarily come from checking our selves against a list of sins or even asking ourselves how we match up in keeping the Ten Commandments. Rather the more we realize how much God loves us the easier it is to recognize our need for his mercy and forgiveness. So the starting point will be the sacred scriptures which tell us of God’s love and the greatness he reveals in sending us his Son, born of Mary. That Son will mature and join us to himself in obedience to the Father’s will. Our desire to be in harmony with the Christ will spur us on to respond in obedience to the merciful love being offered to us. That is what Christmas is for.