Who controls this world right now?  Why is there evil and sickness and suffering?  Satan has control over this world now and in fact Jesus calls him 'the ruler of this world'.  That's why Jesus told us to pray, 'Our Father, who art in heaven, hallowed by thy name, Thy Kingdom come, THY WILL BE DONE, ON EARTH, AS IT IS IN HEAVEN'!  You don't pray for something that is already happening!