The Heresy of 'Carnal Christianity'

Is there such a thing as 'carnal Christianity'? If it is a false religion calling itself Christian, where did it start? Was Marcion of the 2nd century the first Protestant? What about Marcion and the Roman Catholic Church? Did Jesus teach keeping the commandments? Should the Old Testament be discarded? What did early Christian leaders do? What about Martin Luther? Is Andy Stanley right about the commandments, immorality, and not looking at ancient prophecies? …