World Change (that's just what I'm calling it, I really don't know the title)

Have you ever wondered what life would have been like, how you would have lived if some vital piece of history were changed? Well this is the story of a boy and a girl, who were living in the middle of a time change, the change was of the beliefs and superstitions of people because a time traveler decided that life would have been better that way. But what he created was a world not only of prosperity and understanding; he made it possible for the worst evils in the world to be born. And for some reason it is up to these two children to put right the wrongs he did even if it meant losing whatever hopes and dreams they had for themselves. For the good of the world and mankind, these children have to reverse the time change. But can they do it? Will they stand by each other, trusting or will they lose hope and let mankind fall into disaster for the greatest evil of all time has just risen: Skarrov the Heartless has been created by a sorcerer and the children must destroy him if they ever hope to save the world.