As a Theologian DnD 5E Feat you have an extensive study of religion rewards you along with the following benefits:
- You can increase your intelligence score by 1, up to the maximum of 20.
- You do gain the proficiency in the religion skill. Suppose, if you’re already proficient in that specific skill, also you do add the double your proficiency bonus for checks that you do make with it.
- You do learn the thaumaturgy and detect evil and good spells. You can also cast the detect evil and also good once without expending the spell slot, and you also regain the ability to do so whenever you do finish a long rest.