There are varying degrees of evil but any manifestation of evil represents a space where the Spirit of God is not.   

God created that space where He is not when He gave created beings Free Will.   To the extent that man rejects the Holy Spirit, evil manifests in him and through him.   

Lucifer ( Satan) rejected the Holy Spirit and he is now devoid of Him.   Those who follow Satan's lies about God also reject God to a lesser or greater extent.   

When a person persists in rejecting the Holy Spirit they end up just like Satan and can be considered Satan's spiritual children.   

Why did God create the space where He is not?   
why did He give man free will?   

The answer is that He is love and good and desires to have an intimate, personal relationship with us.   

He has enabled us to come willingly to Him rather than forcing us.   The Holy Spirit Of Christ Jesus draws us to Him and we by our Free Will receive or reject Him.   

Don't be a fool and doom yourself to Eternal Death in the evil void where the Spirit Of God is not.   

The thief comes not, but for to steal, and to kill, and to destroy: I am come that they might have life, and that they might have it more abundantly. Joh 10:10 The thief is Satan who is the inspiration for all the evil in the world.      Whereas the `I` is Jesus who offers us Eternal Life and Abundant Life.      This verse is a powerful statement contrasting the nature of the enemy with the nature of our Lord Jesus Christ.      Note that the enemy takes by force what is ours, while we must appropriate by faith what is ours in Christ Jesus.      The appropriation is not a `one and done` thing.     Rather, it is an ongoing process throughout our lives on this earth.      Jesus has given us His life in giving us His Holy Spirit who is in every believer who has asked to be filled.     We aught to invoke His life into every aspect of our walk in the earth.

The above verse tells us where all evil comes from and it tells us where all good comes from.   

Let him eschew evil, and do good; let him seek peace, and ensue it. 1Pe 3:11 Follow peace with all men.     Walk in wisdom and make good choices.

The above verse tells us that the choice is up to us whether we will operate in evil or operate in good.   

Be not overcome of evil, but overcome evil with good. Rom 12:21 What is evil?         ➛ Anything that conflicts with the Will Of God Mat 6:10.      What is the Will Of God?         ➛ That no one perishes 2Pe 3:9.      What does perish mean?         ➛ To suffer aspects of loss, suffering and death Joh 10:10.      What is good?         ➛ Our Lord Mat 19:17 who is Holy Spirit Luk 11:13 and Word Heb 6:5 Christ came to destroy the works of the devil 1Jn 3:8    ➛ bondage    ➛ sickness    ➛ condemnation    ➛ fear    ➛ death We are to continue the work of Christ Joh 14:12.         ➛ We are made Sons Of God by His Holy Spirit in us 1Jn 3:2.         ➛ We are to function as super conquerors on His authority in His power Rom 8:37.         ➛ We are to never submit to the attacks of Satan against us or anyone to whom we have access Jam 4:7.         ➛ We are to give no place for the enemy to occupy Eph 4:27.      This verse is not telling us    ➛ to just be nice,    ➛ to be passive,    ➛ to endure the attacks of the enemy,    ➛ to simply wait for the return of Christ.      Only persecution for the cause of Christ should be endured.      Injustice and wickedness should be fought against with every resource available.

The above verse tells us that we can overcome evil.   Those who choose good ( God) have power to destroy the effects of evil.   This comes by the power of the Holy Spirit in the authority of the Word.   

That is why the Bible uses the term, darkness, to express what happens to a person who rejects the Gospel.   

Essentially all they know becomes irrelevant as to how they function much like a person trying to describe what is in a room and trying to navigate the room when there is no light in the room.