Accepting the death of a loved one is never easy because of the emptiness and shock it gives us. But we shouldn’t be mad at the Lord because he has told us that we will die some day (James 4:15-16; Hebrews 9:27; Ecclesiastes 3:2, 19, 22). Also let’s not forget, we live in a temporal world with man also being temporary, for he is but dust (Genesis 3:19). So people must go on with life because the world continues, and if you don’t try to go on, you also will be dead (Eccl. 1:3-4).
That’s why it's so great to be a Christian. Having God in your life so he can take care of all your problems. Yes, you cannot make it in life without the Lord, because if we fail to serve him now what answer will we give him on Judgment Day? And if we don't believe in him, how can we have any hope after death? The best thing is to serve the Lord and have peace, for its the only way to be safe.