True that unless the Holy Spirit draws a man (John 6:44) they will not hear. However, its also true that we are not only to preach the Gospel to those who are ready to hear...but those who aren't. You have no idea if they will be listening or not. An honest conversation is what I am suggesting. They can choose to hear or not...Just like Agrippa or the Pharisees. Their unbelief didn't stop Jesus...it didn't stop Paul...and it shouldn't stop us.
Romans 10: 14, 15
But I've long had the impression too many here (and it may be amplified by the ability to say something in relative anonymity) are spoiling for a fight or to get in someone's face. That's not going to help anyone. Probably pushes them farther away.