evangelicalism

This term carries a strong association with zeal and active proselytization. While it primarily describes a specific theological branch of Christianity, it often evokes a sense of urgency and a conviction that a particular truth must be shared with the world to ensure salvation or moral correction.

In a broader, non-religious sense, the word can describe an intense, almost religious devotion to a secular cause or ideology. In such contexts, it suggests a level of commitment that borders on the fanatical, where the goal is not just belief but the widespread conversion of others to a new way of thinking.