I listened to some guy on MP3 today who said that both Adam and Lucifer had a weakness and God purposely created them this way. God planned everything and knew it. He knew that Lucifer would sin and that Adam would fall because if he didn't knew it and if God simply made a mistake then he isn't God. This means God knew it and planned it and Satan is almost like God's servant and he cannot do anything which God doesn't allow him to do. What do you think about this?