I don't know of any evidence for some sort fight between those on God's side and those on the side of one of his God created "enemies". That is assuming God exists which is a big assumption.
If God did indeed create enemies for himself and he is all powerful I'm sure he can win the fight without my or your help.
For me there is no fence other than those created by religious leaders who make a good living out of creating imaginary enemies to fear. If there is a choice to be made then I would say that it is to strive to be fulfilled and to do what we can to help others do the same.
By the way if we are very special to the creator why do you liken us to laboratory mice in some experiment? Even as a kid I wouldn't let my pet mice be used in laboratory experiments.
