theologisch
theological
Relating to theology, that is, the academic study of God and religion.
Die beiden führten eine tiefgründige theologische Diskussion.
The two had a profound theological discussion.

theological
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theological
Relating to theology, that is, the academic study of God and religion.
Die beiden führten eine tiefgründige theologische Diskussion.
The two had a profound theological discussion.

The adjective 'theologisch' (theological) is derived from the noun 'die Theologie' (theology). This word comes from Greek: 'theos' means 'God' and 'logos' means 'teaching' or 'science'.
Er studiert Theologie, um Pfarrer zu werden.
He is studying theology in order to become a pastor.
'Theologisch' (theological) is typically combined with nouns from academic or intellectual contexts, such as 'eine theologische Frage' (a theological question), 'ein theologisches Argument' (a theological argument), 'eine theologische Fakultät' (a theological faculty), or 'theologische Schriften' (theological writings).
Das ist eine sehr komplexe theologische Frage.
That is a very complex theological question.
This word belongs to technical and educated language. It is used when talking about religion in an academic or systematic way.
In seinem Buch untersucht er das Problem aus theologischer Sicht.
In his book, he examines the problem from a theological perspective.
religious
'religiös' and 'theologisch' can both describe religion as a topic. 'religiös' is more general and fits with faith, religious holidays, rules, or texts. 'theologisch' is more precise when it is about the academic or specialist study of God and religion. The words can be confused because theological questions always have to do with religion. But a religious text is not automatically theological; 'theologisch' sounds more like study, expert discussion, or research.

Eva hat einen theologischen Artikel über das Gebet gelesen.
Eva read a theological article about prayer.
Im Museum gibt es viele religiöse Bilder aus dem Mittelalter.
There are many religious paintings from the Middle Ages in the museum.