And do you honestly rely on science in other matters: for example, its belief in evolution and its advocacy of stem cell research? Or, on the other hand, is your appeal to science only when science accords with your religious principles? If not a cafeteria Catholic, are you perhaps a cafeteria science proponent? Since when do Catholics believe that the definition of a human does not include a soul? Perhaps this is a legal argument, but hardly a religious one. Whether the former or the latter, there are plenty of counterarguments, some of which have already been expressed.
Actually the Catholic Church teaches that scientific truth and religious truth cannot possibly contradict each other, because they both originate from God, who is the source of all truth, whether scientific or religious. But with scientific truth, we will often find that one group of scholars disagrees with another group of scholars, and the issue of which scientific opinion is correct, is not settled. The Catholic Church doesn’t have a dog in the fight for/against Darwin’s theory of evolution. The CC believes it did receive the charism to infallibly determine truth in matters of faith and morals, but NOT in matters of scientific truth, or what are going to be next week’s winning numbers on the lottery. Thus, the CC takes no position in favor of or against the theory of evolution, and will let the scientists sort out this one.
Certain Evangelical Christians take a totally different position and reject the theory of evolution in favor of “Young Earth” theory, because they believe the Book of Genesis gives a literal, scientifically accurate account of how the universe was created. But the Catholic Church is in notable opposition to these “Young Earth” and “Young Universe” Evangelicals. The CC believes that the Book of Genesis was never even meant as a scientific textbook on the origin of the Earth/Universe. The CC also believes not everything is meant in a literal manner. Another example from the New Testament regarding how some speech should not be interpreted literally, as a scientific textbook, is the parable of the mustard seed. Jesus tells a parable where he likens the Kingdom of Heaven to a mustard seed. The mustard seed, he tells, is the smallest seed, but when it grows into a full-fledged tree, it becomes greater than other plants, and the birds can make nests in this tree. Now, based on the literal interpretation, one could accuse Jesus of being a liar, because there are smaller seeds out there than a mustard seed - the poppy seed, for example. However, the literalists would miss the point that Jesus was not giving a botanical science lecture, he was simply making a point that a large audience would understand, about a small un-impressive seed growing into something big and impressive. The CC takes the same attitude about the Book of Genesis - it does not regard it as a scientific textbook on how and when exactly the world was created.
Regarding stem cell research, the CC doesn’t have a beef with stem cell research. It does have a beef with killing human beings for the purpose of obtaining stem cells. So, if we obtain stem cells from the umbilical cord blood of a fetus, without harming the fetus, that’s OK with the CC. Or, obtaining stem cells from an adult person’s skin, or fat tissue - that’s also OK with the CC. The CC also doesn’t forbid the creation of non-human embryos (say, chimpanzee, dog, rat) for the purpose of killing them and harvesting their stem cells for research. It does forbid, of course, to create human embryos artificially (as opposed through sexual intercourse between husband and wife) and to kill them in order to harvest their stem cells.
Actually I’m a scientist and I find the CC’s positions sensible on scientific issues. But other scientists who want to kill human embryos for their stem cells may not agree with me. In my opinion, they are like Adam and Eve who had a lot of trees in the garden of Eden, all of which were suitable for food and pleasant to eat, but they **had to **eat the fruit of the forbidden tree, just for the heck of it. We have many working treatments based on adult stem cells and umbilical cord blood stem cells, while on the other hand the embryonic stem cells have never benefited anyone. They tend to grow into some sort of proliferating, uncontrollable, cancerous tissue. Just recently a cardiologist I had the honor to meet in person achieved some very nice results by injecting post-myocardial infarction patients with “adult stem cells” obtained from their own body. I do not know of anything similar, that benefited patients, obtained in practice after killing human embryos and using their “embryonic stem cells”. Well, even if that would work beautifully, the CC would still regard it immoral to kill a human being for its stem cells. But, in practice, it doesn’t work so far. There’s no medical necessity to kill human embryos, because embryonic stem cells do not show any medical benefits. For those who want to understand the fundamental questions of embryology, they could ethically do that on animal species - at least from a Catholic standpoint (animal rights activists may disagree with the CC). So, if human embryonic stem cells never benefited anyone but made people sick by growing into tumors after injection, and if basic human curiosity could be satisfied by experimenting on rats, dogs, and monkeys, why are the proponents of human embryonic stem cell research so hell-bent on creating human embryos for the sole purpose of killing them and harvesting their stem cells, and why do they lobby the government to fund this wild goose chase with our tax dollars? Because that’s the forbidden tree, the forbidden fruit, and they
must have that, just for the heck of it.