Evolutionary conundrums for believers

Or, if he really needs evidence of each person's worthiness for eternal life, how he can get it about children he causes/allows to die before they've had a chance to use their free will.

Or how it can be fair play to make everyone other than the original offenders responsible for a sin committed before they were even born.

But the acceptance of evolution by all but the hardiest of Christian fundamentalist poses what might well be the determining question for wavering Christians. We now know, as surely as we can know anything in the physical sciences, that humans did not begin with two first parents who looked like us from the word go. We know that we got to be humans by evolving slowly over millions of years from ancestors we now happily categorise as sub-human. If it is true, as Christian apologists insist, that all human beings have immortal souls and all sub-humans don't, there must have been a creature who was the first to evolve enough to be classified by God as truly human and provided with a soul - the first soul ever issued. That creature's parents would have been soul-less. So while that creature, per medium of its soul, would have gained hope of eternal life about 350,000 years later when Jesus died on the cross, its parents couldn't.

On the last day, when all the saved souls will be looking around for the souls of their parents, how will God explain to that creature that there is no point joining the search because its parents never even made the cut? And if you are a parent and a believer, how do you explain it to your children today?