Sin is not death. The only Sin is separating yourself from God. By living a sinful life, you cannot go near God. It's like you covering yourself in gasoline and wanting to get near a fire. You need to remove the sin/gasoline before you can go near the light/flames. Jesus did that for us, but we need to accept it and take it inside us, as a part of us.
Death is a big abstraction. Death is one word to describe what happens when you die. Death is not a switch like turning off a light.

God does nothing simple or small.
When God created man. It is one or two lines. We are hugely complex beings. We are a beautiful art of engineering, Physical and spiritual.
That is just the way I look at it, and I am still learning.