Probably the simplest answer is that Christian history, like most history, is extremely complex and nuanced. It seems that every group has their particular version of history, Christian or otherwise. Toss in modern revisionist historians and you end up with a real kettle of fish. Pre-Reformation histories tend to divide between Roman Catholic versions and Eastern Orthodox versions. There are genuine hurdles to leap to determine which, if any, version is accurate.
To respond to david01, Jaroslav Pelikan was a professor of Church history for almost 50 years, as a Protestant. Towards the end of his life he converted to Eastern Orthodox. And yet, his scholarship had been so complete while a Protestant that he didn't have to rewrite the texts he wrote. His history and development of Christian doctrine, which took some 40 years to complete, is the most comprehensive, even handed work on the subject.
His work was not in researching what other people had to say on the subject. He researched original documents in their original languages.
Not too many years ago I picked up a copy of the Christian History magazine, a part of the Christianity Today magazine. This magazine dealt with the Church of the first three centuries. At the beginning of the magazine there was a section entitled "Did You Know?"
In this section there were over twenty entries that outlined practices within the Church during the first three centuries. Of those 20+ entries, only two are no longer practiced...in the Orthodox Church. (almost all of the entries are no longer practiced by the RCC)
I found this information while researching the ancient Church and wondering what had become of it. And it came from a Protestant source. In fact, every Protestant text I looked to backed the claims of the Orthodox faith.
Why, even Martin Luther refered to the Christian East as the Churches "better half," this is where the term originated, and suggested that Rome be reformed according to it's model.
My wife recently went back to college, the same one we met in and I graduated from 20 years ago. Her Bible prof. actually taught the class that the Bible was put together by a bunch of guys sitting down at a big table and sorting through the available texts! And this guy is a seminary grad! To top it off, my wife suggested he read Pelikan's book "Whose Bible Is It?" He said he hadn't heard of it and asked where he could get a copy of it. My wife told him he could find a copy in the college's library!!!!!
True scholarly work is available. I believe the reason for the lack of Church history at so many Christian schools is 1) laziness and putrid scholarship, and 2) a fear of the truth.
I am a former Protestant who found his way into the Orthodox faith via history. I have two good friends who both have doctorates in history, and teach in a Reformed based college, who have either asked me for resources for their lectures, or refered me as a resource for their students. I've done my homework. But why did I have to do it outside of my time of working towards my degree?
Where's the history teaching?
Peter