Natural Law in simple terms is do what you will WITHOUT harming someone else. Or using another way it is do not do to others what you do not want to be done to yourself.
Too many rules create mental illness.
A household made up of too many rules usually lead to insane and maladjusted children.
Religions demanding puritan standards and declaring sexual expression as dirty created the prostitution industry.
Likewise the Prohibition in pre-WW2 United States led to rise of Al Capone and the illegal alcohol industry.
Man-made rules and rules outside of Natural Law serve to keep the elite and the slaves in their respective places.
I reject religions that have rules and rituals like fasting for several weeks on end, rituals like fixed times for prayer, direction to pray, ritual bathing, ritual circumcision done on children too young to say no to the barbaric procedure, etc.
Religions with rigid regulations lead to damaged people with obsessive compulsive disorder.