My concept of God, who He is, and How He relates to the formed world needs to be understood before I can properly convey what I believe to be true. I suppose the best way to do this is by first asking a question about existence. Could something be created from nothing? Nothing means absolutely nothing in this case, so the only possible answer would be no. Something had to exist before anything else could be formed. If there was nothing existing in the beginning, then nothing would exist today, but this is not the case. We know that something exists, and I believe that all that has been formed was formed from that which has always been (God).
According to Christian literature God existed in the beginning and before the formation of what we now call the heavens and the earth. If it is impossible to create something from absolutely nothing, then existence (God) must have always been, and everything that has ever been formed must have been formed from its (His) substance. In light of this view, it would naturally follow that God is existence in its entirety, and that all things exist as a part of His being.
Mankind, being formed from God's own substance has always existed as something, just not as we are today. The same is true for all other finite things in existence. The only constant in life is change, so all things (Including our universe) go through infinite cycles of transformation, all while existence is self sustaining, remaining as it has always been. Naturally our will is a fading and finite thing. The same is true for creation as we know it, but creation is only limited in regard to infinite transformations, so yes creation is an unlimited thing in essence.