1. Why did so many sects break off into their own groups rather than staying united? Surely the people could have come to some kind of mutual agreement.
2. Where does the idea that Jesus had a twin brother come from?
3. How did Christianity end up with such a negative name? How did it go from love God and love people to boiling your wife? What changed?
4. How come Constantine thought that he had authority to decide what Sundays were for? The Bible is already clear, there was no need for additional input.
5. When people did not agree they were slaughtered, what started this?
These are some good questions to be asking. My response to your first question is this: Some of the reasons the Church split was because it was made up of people and even in a group of Christians people still disagreed with each other. Most Churches do have mutual agreement on things that matter, however it was smaller things in the Church that caused them to split. Things like, how the music is to be played, should there even be music? How should we do communion? How often we should do communion? Things like that are some of the reasons we have so many different sects of Church