Some of my theory's on god and the devil

well i have been thinking lately after being unbelievabley bores from leying in bed all day from having a knee ligement reconstruction (done playing football) and what i have been thinking about is god and the devil and what i think of them, because we have been learning about christianity in religous studies i personally am not a believer in god and the devil but what if they do exist, its started to play around on my mind because god is supposed to be all loving all caring everywhere and hes supposed to see and hear everything and be the "ultimate force" in our world that he "created" but there is also supposed to be a devil who is laso the "ultimate force" . we cannot possible have to ultimate forces but if god did exist surely he would create humans with the brains to create mass destruction weapons such as the nuke and atom bomb, but we have to remember only a small majority of people actually had the "brains" to do this so surely this could be the small area of the devils children? After all i dont think god would want to bring someone like hitler into his "perfect world" so God maybe the "ultimate force" if he were to exist, but maybe the devil is out there but he creates the evil people in this world, there is evil in all of us not one person in this world can say they have never done anything wrong or made a mistake its just not possible. After all this is just a thought but what if iam right just think about it and see how you feel after reading what i have put here and if your a christian i would like to see what you think of this theory all comments are much appreciated.