A knockdown prophecy

[R00tKiT]

Modern humanness is a matter of definition. 

Sure. But will I ever get an actual definition of a modern human ? I want it precisely from the experts in this forum who keep telling me : "That's not how evolution works".
Let's say we have species X and we define modern X by the following charateristic: "all members of the species X whose tail is >= 15 cm". Now the first observable member that has a tail longer than 15 cm will be the first modern X. I am sure that wasn't very difficult to define.

even if there is such a first human, it isn't a first human in any objective sense.  

Um.. what ? 
There either is a first modern human or there isn't. Again, this shouldn't be difficult.

Adam, however, according to scripture is objectively the first human.  You're trying to fit a square peg into a round hole and aside from the unintentional hilarity of watching you try, it has no merit.

You mean religiously the first human.. anyway, I am sure the only reason why you're reluctant to acknowledge the fact that there is a first human is because it supports creationism.