God created man in His image in the Garden of Eden. Man was given a command to have dominion over all creation (Genesis 1:26) and also have dominion over sin (Roman 6:14). God created the first man Adam, who was overcame by sin after being tempted by the crafty snake as said in Genesis 3. The Lord came up with a redemption plan to save man from the grip of the devil. Jesus Christ was then sent to come down and die for our sins. When you accept Jesus Christ as your Lord and Saviour, you become a new creation. You are sealed by the Spirit of God.
THE DEVIL WILL LOOK FOR A DOORWAY TO ACCESS A CHILD OF GOD
The enemy is roaring like a lion, seeking someone to devour (1 Peter 5:8). He is looking for an entry back into your life. The Bible says that when you accept Jesus Christ as your Lord, you are set free, you are delivered from all torments, all sicknesses, and all afflictions in the Name of Jesus Christ. After receiving this grace of salvation as a born-again child of God, you should maintain this blessing.
As said above, the devil will not give up on your soul. The evil spirit which was cast out of your life when you received Christ Jesus will look for a place to stay, it will keep coming back to check if you are still living a righteous life. If it returns and finds that you have backslidden, it will go out and recruit seven more evil spirits to settle in you, they will make your situation worse than it was before (Matthew 12:45). There are doorways that the devil uses to access a human being if you possess what belongs to him.