The Hebrew word
chatta'ah, translated sin, is offence, and the Greek word
hamartia translated sin, is offence, but emphasizes that it is due to missing the mark.
So, anything that misses the mark of God's standard of right, is an offense to God - sin.
Sin, thus, only enters the scene when something goes in opposition to God, and that is what the angel who got the names Satan (opposer), and Devil (slanderer) did.
He introduces things that were in opposition to God.
There is only light and darkness.
To go away from light, is to head into darkness.
Jesus spoke about light in this way. The scriptures themselves called Jesus light.
So, before God created, there was light, and darkness outside that light.
Would God consume the darkness? I believe that in time, darkness would be completely consumed, and light alone would remain.