In a friendly effort to get my friend SlowCowboy to eat his words regarding the importance of the doctrine of transubstantiation, I also want to present my case for a “Great Apostasy” during the very earliest history of the church.
There was quite a bit of discussion about transubstantiation because Gnostic Docetists were being theologically cast out for taking the doctrine of transubstantiation too seriously. They didn’t take the bread and the water because they did not believe that Christ could be present in the bread and water because Christ was completely separate from the world. The doctrine that the bread and the water were also the Christ makes a very deep philosophical (not spiritual) point that the Gnostics Docetists were not getting. i.e. that the substance of Christ was before us and actually present, even inside of us. This is perhaps a stronger point than “the Kingdom of God is in our midst” but it is really quite breathtaking as far as theology goes. The doctrine of transubstantiation allowed people to explain their faith accurately to pagan peoples.