As human beings, being sinful in our actions, we will sometimes reject the Word of God.
We really can’t say “Believe in this believe in that” because people will think you’re forcing them to have religion. It is, however, nice to tell them the salvation they’ll have in Christ but that’s all that you really can do.
Karyn, I am truly sorry to hear about David’s spiritual choice. We can only hope and pray that he’ll accept Jesus in his life.