"No matter if you or he believes in God, he needs to know how important he is, and that death and dying is a part of living. These things happen sometimes. No one is picking on him or hates him. And God has not forsaken him. It's a tough time for him, and it will take time to heal. Keep his faith strong."
I suspect you mean well, maxx10, but I absolutely disagree with you here. If the grieving party does not believe in God, you should not bring up the subject of God at a time like this. If the person in grief brings it up, then it's thoroughly appropriate to discuss your beliefs in the matter, but leave it to them to take the lead on this issue in particular. I know that some who proselytize do so out of a sense of compassion--that they are working on saving the immortal soul of those who don't currently share their religious beliefs--but this is extremely rarely how it is felt by those on the receiving end. As one of those without faith, I resented strongly the number of people who felt the need to bring up their religious beliefs in regard to the death of my mother. Since they knew I did not share their beliefs, it came across to me that either a) they were using her death as an opportunity to try to convert me; or b) they were not considering my thoughts or feelings on the subject, and merely saying things to make themselves feel better. In the latter case, I didn't snap at any of them, as I knew they were grieving themselves, but I did resent feeling that I had to restrain myself given that my own emotions were strained substantially more than their own (death of a parent is a lot harder to deal with than death of a cousin, in general) and this was merely adding to it. In the former, I also didn't snap, but there's one particular church I hope to never feel obligated to go inside again, as I still (years later) resent the opportunism and callousness I felt in the preacher who chose to use my mother's funeral to scold people for attending a funeral but not showing up to weekly service. (My brother and I chose to hold her funeral at a Catholic church, even though we hadn't been raised Catholic, as most of her extended family is Catholic, and we thought it would be comforting to them. Therefore, of course the people present weren't showing up at his church on a weekly basis--those of us who lived there weren't Catholic, those who were Catholic came in from out of town for the service. We told him this when we arranged for the wake and the funeral, so it wasn't like it was a surprise.)
I am in no way trying to say that your belief in God is wrong or inappropriate. All I am saying is that if the grieving party does not share your views, you bringing them up at a time like this has a strong possibility of making the matter worse for that individual. Statements that you find comforting because of your beliefs can easily be irritating to those who don't share your beliefs, and the death of parents of a young person is not a time when you want to do something which is that likely to make things worse for the bereaved.