This is from Dale Ahlquist's new book All Roads.
Shortly after I became a Catholic, I was talking with a Catholic woman who said she had always wanted to find out more about the different Protestant churches. I told her that all she had to do was take the Catholic Church and start cutting parts of it away. That is basically what each Protestant sect is. Each has kept something, but has left out smething greater. Some have, for instance, kept the Bible, but have left out the atuhority of the Church, which gave us the Canon of Scripture. In some cases, they have kept the sovereignty of God, but left out free will. They have kept heaven, but left out hell. They have kept the Virgin Birth, but left out the Mother of God. And they have kept the homily, but left out the priest. What most Protestant converts finally realize is that their church has something it still calls an altar, but nothing called a sacrifice, which is the only thing an altar is used for.
Chesterton marvelously illustrates this idea in - where else? - one of his Illustrated London News essays. He says that a man who builds a pile of stones and burns a sacrifice to his god is obviously doing a religious act. It makes sense that over time, others would come and participate in such a ceremony, and that he might give them benches to sit on and build a roof for them to keep them out of the rain, and he might turn some of his prayers into ordered chants that can be repeated, and he might take the opportunity to address the other people and explain what he is doing, and write down the prayers and the chants in a book and place the book on a lectern from which to read it to the others. But in any case, no matter what is added to the religious act, it is clear what the religious act is.
So what do the reformers do? They don't tak away all the additions. They leave the had benches and the lectern. They take away the real religious thing. They take away the altar. They take away the sacrifice. They take away the God.
In most cases, it is not what heretics add that gets them into trouble; it is what they take away. It is not so much that they believe a lie, but that they settle for something less than the whole truth. They prefer the tiny bit of truth they have kept to the gigantic truth they have left behind.