“Except for the underground Christian Church that God has always kept.”
There was no such Church. Even Protestant historians admit it: http://www.amazon.com/Baptist-Successionism-James-Edward-McGoldrick/dp/0810836815
I was particularly interested in how they dealt with controversy, either within their own closest religious communities, or when dealing with erroneous movements like the Gnostics, the Donatists, and so forth.
I was looking for rational, patient, persistent approaches. I was looking for balanced people able to be reasoned with; strong for the truth; humble enough to be corrected. I found them!
One could write a History of the Catholic Churh based on crimes, just as one could write a History of the United States of America based on crimes. It would be stirring for those who enjoy the thrill of moral indignation; it would also be biased in a deeply damaging way. But I found it very restoring in mind, heartm, and spirit, to read history based on saints who, like Christ, were truly full of mercy, and would rather suffer than inflict suffering.