IPA: /nɒnθiˈɒlədʒɪkəl/
KK: /nɑnθiˈɑlədʒɪkəl/
Not related to the study of religion or religious beliefs.
The discussion was purely nontheological, focusing on philosophical ideas instead of religious ones.
Nontheological → It is formed from "non-" (meaning not) and "theological" (from Greek "theologia", meaning the study of God or divine things). The word "nontheological" means not related to the study of God or theology.
Think of 'non-' meaning not, and 'theological' relating to the study of God. This helps you remember that 'nontheological' refers to something that is not connected to the study of divine matters.