Heretical, reminds of hierarchy which means divisions of labor with set rules, therefore one which doesn't follow the set rules is "heretical"
Theoretical => related to accepted beliefs......Heretical => departing from accepted beliefs
HERE-tical means orthodox. Here can be inferred to be what is current.
Focus on the HE--In "The Scarlet Letter," HEster Prynn was considered heretical for violating their beliefs.