"I'll rephrase, IMO, all believers should be insulted when a person who thinks you are stupid and childish tells you how to interact with each other."
So if the Good Samaritan had told the believers who passed by the ailing man that their scripture says to help their neighbor, then the "religious" should all be insulted?
Ro 2:14(Indeed, when Gentiles, who do not have the law, do by nature things required by the law, they are a law for themselves, even though they do not have the law, 15since they show that the requirements of the law are written
on their hearts, their consciences also bearing witness, and their thoughts now accusing, now even defending them.)
So go consult instead. Ask the Godless atheist how to live out the bible. Learn from him, he rejects the bible, but he knows how you should treat other Christians. Have at it!