(quote from RealReality.org/Real_Faith_and_Reason_Vol_2_-_Scientia.pdf)

Humans can sense the world around them and react with animalistic instinct without divine revelation. Humans can also memorize Scripture, poems, songs, hand motions, and lies without divine revelation. They can learn to playact, pretend, deceive, or persuade without divine revelation. They need divine revelation to reason rationally to a conclusion. They need divine revelation to know the truth.

(end quote)