Does the preacher in your church ever borrow from something that isn’t the bible to make an illustration of something that is in the bible?
If so, is he committing the same sin of which you are accusing others?
God also indicates that His attributes are “clearly revealed through what He has created.” Right away this also leaves room for the world of things outside the bible to be used as witnesses.
You are like the man who believes memorizing the airplane manual will, in fact, qualify him to fly the airplane when he hasn’t so much as cranked a propeller.
What sin is that ? I did mention Mel Gibson committing adultery after he made the movie. Is that the sin you are referring to ?
Do you imagine that the Messiah did not memorize all the scriptures ? Have you ever thought that thought ? Do you love the scriptures that He loved ? Not a sermon, just a thought ...