Not all of it.
If there's no fertilization, there's no life to kill.
Even Catholicism's vaunted *natural family planning* is technically birth control because it is used to avoid conception.
That makes all couples who use it murderers also in your book.
“ Anyone with a remote sense of natural law knows birth control is killing.”
I meant Anyone with a remote sense of natural law knows abortion is killing.
And therein lies the problem. Artificial contraception has a higher than advertised failure rate, and is accompanied by an anti-human attitude. Abortion is generally the backstop for failed artificial contraception.
Fertility is natural, a properly functioning reproductive system is not in need of "medicine" or "protection".
Male fertility is not a poison, but artificial contraception treats it as a poison.
Female fertility is not a disease, but artificial contraception treats it as a disease.
A couple monitoring the wife's fertility cycle is treating her fertility as a natural part of life, not as a disease to be treated.
But you already knew all that ...