If a non christian couple marries and chooses not to have children for whatever reason what are their options. Mechanical Birth Control, Chemical Birth Control and Sterilization. These are currently legal yet immoral by Catholic standards. Also legal but immoral is abortion. All the choices are immoral by Catholic standards. All are grave sins.
If Catholic sin isn’t a concern, they are agnostic / atheist, it’s very hard to argue against birth control. So if birth control fails, their only option is adoption. You are going against the woman’s right to self determination. She doesn’t want children.
So again viability rears it’s ugly head. If we are going to force her to carry the child, how long to we have to force her. We are making her sacrifice some of her rights. Are we going to have to confine her for 5 months to make sure she keeps the well being of the child at the forefront? Not abusing alcohol, drugs etc Keep her away from dangerous situations that might harm the fetus.
Even Judaism the root of Catholicism says the embryo is a life in development, not a human life.
en.wikipedia.org/wiki/Judaism_and_abortion