When you say “natural law and common sense”,
leftists don’t have the automatic, visceral reaction due to their rebellion, to not listen further,
like they would if you say “God hath said”.
Of course, we know that these “natural” laws are simply the visible expression of the character and nature of the perfect and holy Creator.
No, they are His feeble reflection in a fallen world.
They were capitalized on by a worldly church to justify its worldly ideas.