I just found this article on a Catholic website, Catholic online. It confirms what secular news says – that the Denisovans and Neanderthals interbred with modern man but doesn’t explain how this can be reconciled with monogenism vs polygenism.
catholic.org/green/story.php?id=43487
The first thing which has to be considered is that modern man refers to genes not human nature. While I love science, especially some of its “theories”, I respect its limitations.
In some research, the term modern man has given way to modern genetic man. One of the original terms for modern man was anatomically modern man. None of these terms refer to the complete human person which includes the spiritual soul.
The next thing which needs to be remembered is that science, by definition, does not examine your complete human nature which is the same human nature God created in Adam. God directly creating the spiritual soul is a crucial belief. This direct creation of our soul comes from God and not from polygenism.
It is common sense that anatomies which are built to walk on two legs would have similar genes. It is common sense that animal anatomies have genes which fight off various infections. It is common sense that our material anatomy would be similar to other material anatomies. It should be obvious that some of our material genes could come from similar ancient material (non-human) beings. Recall that
how God formed our material anatomy is not a crucial belief. God creating the soul directly, that is, the soul is not produced by genetics, is a crucial belief.
Once, it is realized that science is talking about only anatomies which rot away, it does not make any difference how many subhumans mate with each other.
In Catholic terminology, monogenism refers to the one source of the complete human nature which you and I have. Polygenism refers only to genetic sources for material anatomies. In regard to your complete human nature, polygenism skips God.
Monogenism insures the unity of humanity. Polygenism, as multiple sources, is part of the reasons for animal and plant diversity.
Monogenism insures that Christ hung bleeding on a cross for
all people.
Monogenism vs. polygenism either recognizes the existence of God or denies the existence of God in our human life. In the Catholic faith, monogenism recognizes that God is not limited by the material world. This does not imply that somehow science is bad. Science must be respected for the good it has accomplished. What is implied is that science, itself, is limited to the material/physical creation. If one wants to understand one’s own human nature, one has to recognize that one’s nature is supernatural in that it unites
both the material world
and the spiritual world.
Just because science does not examine God under the proverbial microscope, that is no reason to eliminate God from the process of human creation. The fact that there are many people who do not believe in God has no power to eliminate God. God exists independently of people’s convictions.
The unanswered question is when did Adam, the first fully-complete human person, live. Because we do not have an exact date is no reason to eliminate the spiritual soul from human nature. One of the results of applying non-human animal principles (such as polygenism) to human beings is that the concept of a spiritual soul is thrown out.
Catholics believe in Divine Revelation protected by the Holy Spirit through the centuries. Our basic belief in the creative power of God is professed each Sunday when the community proclaims the Nicene Creed. This creed begins:" We believe in one God, the Father, the Almighty, maker of heaven and earth, of all that is seen and
unseen." emphasis mine.
Practically speaking, it is not really necessary to know exactly when Adam lived. It is extremely necessary to know his complete human nature. Because of Catholic monogenism, you and I are assured that we have his marvelous nature which enables us to share in God’s own life through knowledge and love.
Admittedly, it is very difficult to hold on to our faith in Jesus as God and Savior when we are bombarded with research about material anatomies of many different kinds of archaic beings.
Monogenism assures us that our material anatomy is the one with the spiritual soul because we descended from the singular person of Adam.