What twisted logic!
Scripture for that please? And more than one. Let everything be established at the mouth of two or three witnesses.
God knows who the Elect are. But by your reasoning, God is not trustworthy enough for us to let Him have that knowledge to Himself.
The underlying unspoken thing you are saying is that you believe that someone could believe on Christ, live their whole life walking with Him, and yet not be saved, and that would be a waste, because they could have been eating and drinking and making merry, i.e. sinning their heads off, if they had known they weren't going to be saved in the end. Isn't that so?
That thinking is in itself a product of the unregenerate mind.
If that is the reason you reject Calvinism, you prove quite clearly that you haven't got a clue as to what Calvinism teaches, and you have some serious issues with Christianity itself.