To put it in other words, a women choosing to abort her child is choosing to kill it, deprive it of the right to live. Or, murder, if you prefer. There is no obligation on the part of a person with kidney disease to expect a kidney be given by one specific person. The receiver of this kidney has no right to expect generosity from another person (though it is laudable to do so). There is an obvious obligation on the part of a fetus to 'expect' to receive care from one specific person, it's mother. I don't understand how this is not self evident to you. Our increased understanding of the biology of reproduction makes this even more clear than it ever has been in our history.
This is my understanding of human nature and human dignity, and yes it is dominated by the teachings of Christ and His church. The early church fathers had the benefit of being familiar with the writings of the great Greek philosophers concerning such things as virtues - something modern society is sorely lacking. The development of many of these teachings aren't just pulled out of the air, they have been carefully thought out and reflected on for two millennia. Somehow, all that knowledge is cast asunder by modern mankind, as, apparently, modern mankind is better in every way that the great teachers who have come before us.
Anyway, that's what I believe, even if it remains in opposition to your beliefs. Hence the battle that is being fought today.