peculiarism
/pɪˈkjuːlɪərɪz(ə)m/noun
1 Christian Church ( depreciative ). Evangelicalism. Compare peculiar. Now historical and rare.
2 Generally. Exclusivity; adherence to a distinctive doctrine or practice.
Origin
Mid 19th century; earliest use found in John Henry Newman (1801–1890), theologian and cardinal. From either peculiar or peculiar + -ism.