It's a pretty sorry state of affairs for a supposedly large group of people whose religious beliefs are commonly based upon the teachings of one man and the writings in one book. Well, the Bible is open to different interpretations, none of which is necessarily superior to the others. However, there is wide agreement on the basic issues by the vast majority of Christians. Given that basic issues are disagreed upon between Catholics and Protestants, your statement is incorrect. There is much more controversy in other areas of human endeavor, such as the study of history, in which there are just about as many different opinions as there are historians.
Nobody goes to war over disputes about history.
Nobody is threatened with eternal damnation for refusing to believe in a particular account of a historical event. There aren't thousands of different and incompatible versions of any historical event with people who will claim that they are all equal. I understand the concept of the Trinity perfectly well. It is not different from monotheism and Jesus and God are not one and the same. This statement makes it completely clear that you don't understand the concept of the Trinity at all.