I’m not so sure they don’t have peace of mind CB. There is a “false” peace which can give an individual a sense all is well....until the light of the scriptures is shed across it..... But then many resist the scripture and hold tightly to their traditions...it’s hard to let go of the sod when one is hanging off a cliff while the rescuer has a hold of their other hand telling them they have to let go and ‘trust’ Him and Him alone.
Some find a great deal of peace for the knowledge they have of their church and it’s system of operating. They know how it works and have found a certain level of contentment in their knowledge....and seemingly ‘Comfort in the familiar’ says it best. And the older one gets the least apt they are to risk change from that which is familiar...it “works” for them...literally.
A false sense of security. I understand the concept. Carnally it is virtually impossible to understand the love of God and His gift. I sometime tend to forget that if God doesn’t call someone they will not hear just as the men with Saul (later Paul) didn’t hear Christ.