Actually I disagree with your point #3. Many of todayâs Christians support the right to kill infants before birth, and there is a growing movement to allow infants with a disability to die (not just those who need âextraordinaryâ medical treatment); sometimes condoned by Christians. (I donât mean I condone, I mean other of âtodayâs Christiansâ do).
I realize this thread is about Presbyterians, so I hope people with more knowledge can shed light from that direction. But speaking about the Catholic Church, it is guided by Scripture, Tradition, and the Magisterium. What you refer to as âtodayâs Christiansâ are deeply influenced by the secular culture, especially the media. Thus, the need for the Magisterium.
Even if 99% of Christians, or Catholics, supported legal abortion, that would not change the reality of what it is. The fact that the secular culture opposes, or forgot the âNatural Lawâ doesnât abolish it, and ignorance of the Natural Law has an impact beyond abortion and homosexuality. Abortion is still murder. I donât know if âtodayâs Christiansâ are holier than âyesterdayâs Christiansâ; not sure why the reference to âtodayâs Christiansâ. The important thing is what is true and right.
The other important thing is the gospel command to love individual persons. The Magisterium is a reliable guide to both of these. Christians are sometimes accused of failing to love. This Christian is sometimes guilty of that, of judging others, and lots of other things. Unfortunately.
The Catechism of the Catholic Church does take into account new insights into Scripture, social science, psychology, and different circumstances that were not envisioned at the time of the New Testament, or at earlier times in the Church.