I'm going to change the tone here. I'm actually going to let you off the hook, because I know you can't back that claim, and there's no point in grinding you with it. That's not nice.
So I'm going to say this, instead. IF you had said, "No evidence I know of exists..." I would have accepted that without a moment's question. If you had said, "No evidence I know of, and none my friends know of," or even "No evidence I have heard from the purported experts I know," I would have had no reason to question your claim.
But when you say things like, "I know nobody knows," then it calls on you to explain how you know every thing everyone else knows, or could come to know. And is it any wonder that I question that? Of course not.
Or if you had said, "I have read all the many purported evidences for the existence of a God capable of constituting a moral objectivity," I would probably ask you which evidences you meant, but I would have no reason to think that you had never entertained any of them.
But when you say, "No such things exist, nobody ever has any, or could have any, and I know they don't exist," I know for certain that all parts of that claim are false, and are nothing but a colossal bluff. For I know the arguments. And it's not hard for me to guess, no matter how smart and well-travelled you may turn out to be, that you do not possess the range of knowledge required to substantiate such a claim. It's just far too wild for a human being to make.
So I have to raise the necessary question about your claim to that.
The solution? Make a more modest claim.