From the time we were born, Satan began to inject us with his mind, thoughts, ways, attitudes, and purposes, so by the time that God gets to us—but in God's good time He calls us and begins to convert us—we are in union with Satan. All our lives, he has been broadcasting, and we are in agreement with him. This is what has to be overcome.
Satan is with us always. But we have to understand that nobody, not even God, can take away our right of choice of whom we want to be in union with. When God begins to convert us, He makes us well aware that we have a choice and that we can resist and determine who we want to be united with—God or Satan—just as we can determine in our own lives who we want to be friends with.
We can choose our friends. We can choose, then, the kind of relationships we have with them. We can walk away from them, if they are pulling us down—away from union with God.
Unfortunately, that has to be done sometimes so that we be in union, at one with, the Father. We hope that does not happen very often. Parents know that at times they have tell their children, "We don't want you to hang out with him or her." Why? Because they know that that other kid will pull their children down, so they do not want them in union with him. It is a simple principle.
God has put us into the position where we have the opportunity to use our time and energy to make the choice of whether we will be in union with Him. He leaves the choice to us. It is a tremendous thing that He does this because it produces wonderful effects.
So we are juxtaposed between, on the one hand, God, and on the other hand, Satan. But we are free from Satan because we have the choice of whom we want to be in union with.