Converting

[R00tKiT]

Yes, it really is. Aside from adding a few hundred cc's of brain matter you'll need to produce a whole shitload of hellishly complex and entirely new neural systems. There's simply no doing that without a few thousand generations of intermediate steps. You'd have better odds of going from a hand-drawn cart to a Porche in a single leap.

I don't think you're really addressing the issue here. The modern-primitive dichotomy is logically forced, if it's hard for you to imagine where the line had to be drawn, it's a lot easier to do so for a deity. Porche wasn't built in a single leap of course, but you would still have a manufacturing date.

Our closest ancestors surely had a similarly complex brain, but there surely has to be -logically- an infinitesimal increment where we're justified to draw the line, and again, it's not hard for a deity to grasp the infinitesimal. To sum it up, you're arguing from ignorance here, we don't really have a lot of details about all the intermediate steps that took place in the distant past.

Another way to put it is this: you have very low IQ and very high IQ people in this world, cognitive ability between the two groups is simply huge -despite being, obviously, in the same position at the evolutionary tree-, what a theoretical physicist is able to understand in a few minutes is beyond the grasp of, say, an adult with below than average intelligence, even with equal access to education/environment/opportunities. And the anatomical brain differences may not be more than a difference of number of synapses per neuron, which can be prompted by a small "click" or stimulation of the synaptogenesis process.

So the anatomical difference between Einstein's brain and, say, his mom's, might roughly be an example of the gap we're looking for between modern and pre-modern human beings.

Another example to clarify my point : world war didn't really start by a single bomb explosion, or some assassination, it came about through almost a decade of smaller conflicts and diplomatic tensions, but we still have starting and ending dates of the event.