They cannot turn a dirt into diamond, because all they could say is: Only God can do that!
I have no problem making the same statement. Although, I definitely have no problem telling them they are wrong if they are the ones who say it.
What then? They would naturally respond: Do you know us (me)? How well?
I would say: Well enough.
And watch these gnashing their teeth or melt away into oblivion.
They care not their own souls, for theirs is pride masked by a superficial humility, masked by irresponsibility, masked by sloth.