If you are are a born again Christian, you have been transferred from the kingdom of darkness, into the kingdom of light. You are in the light and you have in you, the one who is Light, because the Bible says that God is Light. Ephesians 5:8.
When light comes, darkness disappears.
In the first and second chapters from the book of Job, we can see, that the enemy, can not touch a born again Christian, a child of God, because God has provided a hedge, or protection for every one of his saints, every Christian like he did for Job. If he did it for Job in the Old Testament, how much more he will do it for us, who are under the New Testament.
Only if God permits, the enemy can attack a Christian like he did with Job.
If a Christian walks in the light of God’s Word, the enemy can not touch them. 1 John 5:18
Only if a Christian disobeys God and does not walk in the ways of his Word, only then he opens a door for the enemy – Ephesians 4:26, 27.
That is why, we are commanded in Ephessians chapter 6, to put all the armor of God.
Another thing to notice in Job 1:16, 18, is that people thought that it was God who caused the natural or supernatural calamity, but it was not God doing that. It was the enemy doing that. Often, when something bad happens in the life of people, one of the first questions he or she asks is “Why God has punished me like this, and make me suffer like this?” But that is not God. It is the enemy.