As I use the term here, ‘ensoulment’ takes on its meaning as found in moral theology: to have (received) a soul. So, all humans alive today are ensouled. Adam and Eve were ensouled. In an evolutionary context, none of Adam’s or Eve’s ancestors were ensouled. (Since we agree on the Catholic definition of humanity – that is, possession of a soul – we can therefore say that Adam and Eve were humans, and none of their ancestors were.)
Strictly speaking, though, there’s a problem with that assertion (although I’m not certain at the moment that it’s relevant to the present discussion); if by ‘requires’, you mean that the physical anatomy must already be present in order for the soul to be present, there’s a particular problem, which can be illustrated by the phenomenon of twinning that takes place following conception. I’ll leave this issue aside for the moment, since it might take us off-track; however, inasmuch as you use this assertion as your demonstration that cladistics can tell us
anything about ensoulment, it’s important that I continue to reject this part of your argument. (Maybe we’ll come back to this later…?)
Yep; and that’s a pretty trivial assertion… don’t you think? Not valueless, mind you – but nothing that helps move an argument along.
Can you see that these two statements are equivalent? The first statement, for a Catholic, is patently false – we can look to the Catechism and see an explicit statement that God creates the soul immediately, without the ‘aid’ of the parents. The second statement, however, says
precisely the same thing, although it’s fancied up with scientific jargon. Positing the soul as a “material epiphenomenon of the human genome” means simply that the soul is a by-product of a material object or process; in other words, it means that the soul proceeds from the body. If the parents are a cause of the physical body of their child, then they are the cause of its “material epiphenomena” as well. In other words, a Catholic
cannot hold to this statement you’re positing, since it implicitly asserts that God is not the immediate creator of the soul.
Here’s where I believe your argument falls apart. We agree that ‘humanity’ derives from the presence of a soul (‘ensoulment’, as I would term it). We see that the ‘material epiphenomenon’ argument presumes that the soul is an effect of the physical body (and therefore, cannot stand alongside Catholic doctrine – this, by the way, and not the ‘polygenesis vs monogenesis’ debate is the point where science and Catholic doctrine diverge). Therefore, cladistics diagrams cannot tell us where “fully-complete human individuals” exist.
(Incidentally, this is the reason why I asked for a definition that distinguishes between ‘pre-human ancestor’ and ‘human person’. If science – cladistics or otherwise – could provide a relevant definition, then we could work on your assertion. Since it cannot (that is, since “in the process of developing a ‘modern human person’” can mean
anything – and therefore, means precisely
nothing), then it seems that science cannot provide a working definition of the ‘human person’. At the very least, it cannot provide a working definition that can interact with the Catholic theological definition of ‘humanity’.)
To sum up: cladistics can speak of
populations; it can speak of
DNA-level commonalities; it can speak of
common ancestors. However, you have not demonstrated that it can say anything useful in the context of a theological discussion of the human person. Unless it can be shown that it can step up to that table… you cannot make the assertion that cladistics (and its definition of ‘polygenesis’) disproves Catholic theology (and its assertion of ‘monogenesis’).
From a scientific perspective, perhaps. In a theological context – since that context is dealing with humanity (i.e., ensouled persons) – that definition is insufficient. The definition of ‘monogenism’ in theology has to do with the
first two ensouled humans.
And that, granny, is why your assertion fails: science cannot speak to (and therefore, cannot conflict with) theology’s assertions of monogenism!
Unless you can demonstrate that the “final extant hominin population” is human, you can’t make this statement in good faith.