Word Study
religiosity
CIDE DICTIONARY
religiosity, n. [L. religiositas: cf. F. religiosit.].
The quality of being religious; religious feeling or sentiment; religiousness. M. Arnold. [1913 Webster]
OXFORD DICTIONARY
religiosity, n. the condition of being religious or religiose.
Etymology
ME f. L religiositas (as RELIGIOUS)
For further exploring for "religiosity" in Webster Dictionary Online