So now we have New Guineans who look identical with modern humans who are not really human and can not form a spiritual relationship with God. Your view point leads to horrible conclusions. Since New Guineans have existed in that form for 60,000 years then they probably are not related to Adam, since no one has suggested that Eden was in New Guinea. Assuming that people who look, and act like us are not human is largely what propelled racism in the past few centuries. And since all that was done prior to Darwin, racism can not be blamed on evolution.
Racism is a part of the human condition.
Under your view, maybe we better re-evaluate whether or not to send missionaries to them. Don't want to waste our money you know. Understand me clearly. I do not say I have no bias. I make no secret that I believe in Hugh Ross's PC scenario and, therefore, will freely admit to interpreting data in the light of what it would predict.