Many claim to be christian.
Question; what is a christian?
Were in scripture does it say you are a christian, and what are the attributes of a christian?
When did you do the survey to conclude what most Christians or most churches do. Do you most of the Christians or churches in the world or are you just talking about most of the churches and Christians you know or is associated with?
The Bible in the book of the Acts of apostles says that and I quote they were first called Christians at Athens meaning that some people who were not believers in Christ probably the pagans coined the phrase
John 13:35 - By this everyone will know that you are my disciples, if you love one another.