AT:   Actually all those Churches are the ones defining themselves as Christian Churches.  I simply refer to their definitions....I don't provide them.  You and your particular Christian denomination (a recognized autonomous branch of the Christian Church.  synonyms:	religious group, sect, cult, movement, body, branch, persuasion, order, school; church "a Christian denomination""  from Wikepedia.)  You, it seems, define your particular denomination, or perhaps others who belief exactly as you do, as the only "true" Christian Church and exclude all the other Christian denominations who don't have your particular beliefs.....including regarding homosexuality and same-sex marriage.  

Were I teaching "comparative religion", indeed, I would teach the there are numerous denominations of the Christian Church and their beliefs differ regarding many topics.  That is the FACT I would teach.  cont..