I will try not to complicate this for you; yes, Satan’s purpose is to separate us from God. Hollywood using the contract illustration is a simple and visual way of demonstrating a sheep being separated from the flock. God put us here to share a relationship with him and for us to obey and worship only him. Satan is a jealous being and wants glory to himself, thus he feels vindicated every time he turns away a soul from God. Satan cannot have our souls, but if we do not live for God, then we are not of his flock. This is why there are so many instances of politicians, movie stars and musicians who are ripe for this metaphor. They feel they have earned the devotion and love of a crowd and therefore no longer need the guidance of Christ, or to humble themselves before the Lord. God gave us a deep desire for spiritual searching, a want that cannot be satiated on this earth. I hope this helps you.