What are Angels and Demons?

Angels are rational beings created by God. At the beginning of the creation of everything, God created the Earth, and Heaven. At the "time" of this creation, God also created metaphysical, yet finite, beings called angels. These angels are all revealed a certain amount of God's plan. Whether they be archangels, guardian angels, or anything in between, they all chose to be with God or against him. At the time of their creation, they are all revealed a part of God's plan for the world and for humanity, and they choose to be with God or be against him. As such, some of them chose against God. These are what we call "demons," or fallen angels. The greatest of these, Lucifer, was revealed God's plan most of all of the angels. He had the seed of power, a neutral force, that drove him to create a negative force, which caused him to separate from God. By doing so, he created a place in hell for him and his fellow fallen angels to exist.

So what exactly is an angel? Other than the brief description above, an angel can be described as a finite, metaphysical, rational being created by God to assist him in his plan for human salvation. While some turned away from God at their creation, others have stayed with God. The Church teaches that there are at least as many angels as there have ever been, and ever will be, people. That means there's a guardian angel for Johnny who lives down the street, Brad Pitt, and you. These angels are all revealed an equal amount of God's plan. Other than that, there are angels that assist God in his plan in a more general sense.

So now let's discuss whether fallen angels can be redeemed. No. That's the quick answer. The long explanation is that they have an intellect and rationality, but not a body. Because of that, they are transcendent of time and have no chance to learn more to change. While angels are not confined by time, humans are. That means we have time to change and be redeemed. Angels, on the other hand, do not. They are outside any conception of time, meaning they do not have the "time" to be redeemed. Furthermore, they cannot learn more than what is told them at their creation. As such, they can't develop any new knowledge. So salvation isn't that they never had a choice, it's that they can't make another.