You show a lack of historical knowledge concerning Christianity. There are lots of churches that existed as "heretics" under the hegemony of the Roman Catholic Church. Baptists, Mennonites, Brethren, Amish ... look to any "denomination" that grew out of the Swiss anabapist movement. They pre-existed the Reformation and survived horrible persecution for centuries prior to Martin Luther's nailing his treatices to the church house door. So the contention that they were created from the "Holy Roman Catholic Church" is a sign that you don't know history very well.

Also, most historians agree that someone named Jesus existed in the 1st century. They don't all agree that He was God incarnate, but His existence is not under any real dispute among actual historians since non-Christian historians in the 2nd century wrote about Him and the movement He spawned. Might want to read up on the subject.