different beliefs

I've encountered a whole variety of Christian related belief systems in recent years. It's often surprising - and kind of disturbing, to be honest - what people will subscribe to. 

There are people who believe that the real gospel is the book of Romans, and the gospels and acts aren't really relevant to us. Then there are those who take the opposite position and want to completely remove Romans and everything else that Paul wrote, from the Bible and just follow the gospels. 

Another weird one I've encountered was a group that believed that Yahweh - the name for God in the Old Testament - is actually Satan.