By that "logic", so is Mormonism, JW, etc.
Confusion ensues and the term "Christianity" is tarnished in both unbelievers' views and some believers' views.
"Guys we cannot tell people apart, they are all identical! You must lump everyone under one term, stop differentiating!"
There are two sects of muslim, sunni and shia.
So why can't we divide believers into Biblical Christians and compromised/worLdly/ukewarm Christians and those who believe contraBiblical ideas?
Revelation 3:15-16.
Also, I repeat my question.