What is another word for "indevotion"?

Roget's Thesaurus (1911) lists these synonyms for "indevotion": agnostic, agnosticism, alien, antichristian, antichristianity, atheism, atheist, atheistic, belief, bout, carnal, dechristianize, deism, deist, deistical, devoutless, disbelief, disbelieve, doubt, earthly, faith, faithless, fort, freethinker, freethinking, gentile, giaour, godless, graceless, heathen, hylotheism, incredulity, incredulous, incredulousness, indevout, infidel, infidelity, irreligion, irreligious, irreligiously.