Arianism is the belief that the Father was much more important than the Son, and in a way they didn't really acknowledge the Son, to the point where they considered him a "created being". Received the Stamp of Heresy in 325 AD.
@PetersSmith: Just because it is rooted in Christianity does not mean it is Christianity, Look at the Name Christ-itanity referring to followers of Christ, In fact the ones who decided to accept Jesus as the messiah were considered Christians.
@scots - I agree. "Followers of Christ", in my case does mean they believed in his physical existence. There are few religious, or non-religious, or historians, that deny the actual existence of a guy - in that time frame - doing some of what others said he did.
Roodvlees - I agree that some preachers probably do it as a job, but if they didn't really believe that Christ was the son of God or they just didn't believe in him, would they really be Christians? The term 'Christian' - I mean I don't think a person actually is a Christian if Christ wasn't the son of God. (Or other than that - A Christian really can't be Christian if they don't believe Christ even existed.)