While I agree about your concern with homogenizing all Christians, your statement regarding Constantine's roll in the formation of the Christian canon is lacking thorough research and more due to the fictional works of Dan Brown than serious history.  If you are interested in truly looking at text criticism, manuscript evidence, and issue of transmission, see Daniel B. Wallace's research.  His organization has more source documents and manuscripts than anyone else on the planet.  Constantine was simply backing a winner for political purposes, not forming anything new or making something common somehow more powerful. 

http://www.dts.edu/media/play/jesus-canon-and-theology-darrell-l-bock-daniel-b-wallace-and-ben-witherington/ 

To pick and choose what one likes about Jesus is illogical.  It simply places oneself in the position of arbiter, not history.  It also is irrational to see Jesus as simply a sage, because he would be horrible cult leader if he was lying or wrong about himself.