mythicism

Short definition from Wiktionary

Noun

1. 1
   The scholarly opinion that the gospels are mythological expansions of historical data.
2. 2
   The habitual practice of attributing everything to mythological causes; superstition, the opposite of rationalism, or of realism.
3. 3
   The creative potential for the creation of mythology; the faculty of mythopoeia.
4. 4
   The view that a certain figure or event is unhistorical or mythical, chiefly in the context of pseudo-scholarship.
5. 5
   The view that a certain figure or event is unhistorical or mythical, chiefly in the context of pseudo-scholarship: The opinion that Jesus of Nazareth did not exist.