theology
/θiˈɒlədʒi/·시올로지·noun
the study of God or religion
GreekCEFR C1
Root
theo- (god) + Greek 'logos' (study)
Greek theologia (discourse about God) → Latin theologia → Old French theologie → English theology
In a word
theo (god) + logos (word) = 'words about god'. The same theo lives in atheist (one without god), monotheism (belief in one god), pantheon (place of all gods). Add a- (without) and you get atheist; mono- (one) and you get monotheism. A single Greek syllable threads through the world's religious vocabulary.
Examples
She is studying theology at university.
Medieval theology shaped European thought.
He wrote a book on Buddhist theology.
Related
atheisttheismpantheonmonotheismtheological