"But why?"
"Because the Bible said so."
"How do you know the Bible's right?"
"The Bible said so."
This is the reply I get, and then they get mad at me when I keep pressing the point. They'd be total hypocrites to say something like "don't believe everything you read", which a lot of them do.
The other thing that bugs me is this whole stem cell research issue. They just know embryo has something to do with child in womb, so they think it's killing children by default.
It's not.
An embryo is a container inside which the fetus grows, the embryo helps supply the fetus with nutrients, and, primarily, stem cells.
Stem cells are cells that are, upon entry into the fetus, "programmed" with a certain purpose. Once they're programmed, they fill out that purpose. They may become heart cells, lung cells, spinal cord cells, muscle tissue, anything needed to comprise the baby.
What Stem cell research is trying to do is take embryo's that haven't programmed their stem cells yet, so you can program the cells yourself to do a certain thing. What this will accomplish is that when someone has had a fire accident and part of their anatomy is burned off, stem cells can grow it back. If someone suffers a spinal cord injury, we can remove the damaged spinal cord and literally grow back a new one. This could, quite frankly, be a cure for cancer, the medical properties of this, if we pull it off, are profound. And I personally would rather save a life than replace it.