This is inconceivable.
Since the shepherds were much like each one of us, they faced a round of old sins when they returned to life as usual. In the light of their experience of looking at the face of the baby Jesus, in the light of their understanding of that situation, can we imagine them continuing to live in sin as though it were normal, without being sorry and having real repentance? I think not. I would suggest that the shepherds, full of the reality of what they had seen in the heavens and in the manger, would have been sorry for their past sins and even more if they sinned again.
FRANCIS SCHAEFFER
No Little People
No Little People