"The impression of the decisive contrast between life and death is often still so strong in our life that we have but little eye for the light which Christ's message radiates, and this is true also in regards to the transition from death to life." G. C. Berkouwer
Death is in the secular world the ultimate enemy. You can read of modern computer scientists and others hoping to escape death by in some what surviving or preserving their body to have their psyche uploaded into a computer.
In Christianity of course for those with faith death is merely a gateway to be with Jesus. To the sinner who repented on the cross Jesus said, "Today you will be with me in paradise."
You see if we see with perfect faith death is not the enemy for the Christian but merely the beginning of a new chapter of peace in the presence of God.
The sadness exists in death of course that our work is done, but it is mixed with joy. It is truly difficult to see the bible's perspective at times as our faith is weak.
But God's grace is always with us. He loved us while we were still his enemies and he knows our frame.