Original: People who deviate from orthodoxy by professing a doctrine considered to be false are most often called heretics or radicals , while those who deviate from orthodoxy by removing themselves from the perceived body of believers are called schismatics .
Simplified: People who profess a doctrine considered to be false by the majority are most often called heretics . People who separate themselves from the body of believers , i.e. from full communion , are called schismatics .