Belief or opinion contrary to what is generally accepted

Answer: Option D

One word substitute is Heresy.

Unbelief: lack of religious belief; an absence of faith.
Superstition: excessively credulous belief in and reverence for the supernatural.
Non-conformity: the principles or practice of Nonconformists, especially Protestant dissent.
Heresy: belief or opinion contrary to orthodox religious (especially Christian) doctrine.