The Collaborative International Dictionary of English v.0.48:
Religionism \Re*li"gion*ism\ (-?z'm), n. 1. The practice of, or devotion to, religion. [1913 Webster] 2. Affectation or pretense of religion. [1913 Webster]WordNet (r) 3.0 (2006):
religionism n 1: exaggerated religious zealotry 2: exaggerated or affected piety and religious zeal [syn: religiosity, religionism, religiousism, pietism]