Most of these people don't have a teachable spirit that comes when you're born again, so, sadly, anything that I've tried to tell them is not even heard or considered.
3. But if our gospel be hid, it is hid to them that are lost: 4. In whom the god of this world hath blinded the minds of them which believe not, lest the light of the glorious gospel of Christ, who is the image of God, should shine unto them.
2 Corinthians 4:3-4
That doesn't mean that you shouldn't try, though. Right?
14. How then shall they call on him in whom they have not believed? and how shall they believe in him of whom they have not heard? and how shall they hear without a preacher?
Romans 10:14