And how do you know the future? Pregnancy is a notmal function of the body. If a woman is so sick she cannot give birth, certainly she isn't up to having sex.
"Protection of the life of the mother as an excuse for an abortion is a smoke screen. In my 36 years of pediatric surgery, I have never known of one instance where the child had to be aborted to save the mother's life. If toward the end of the pregnancy complications arise that threaten the mother's health, the doctor will induce labor or perform a Caesarean section. His intention is to save the life of both the mother and the baby. The baby's life is never willfully destroyed because the mother's life is in danger."---- C. Everett Koop, M.D., former U.S. Surgeon General
The "life of the mother" fallacy doesn't work for abortion so why should it work for contraception?
Like I said before, the birth control arguments parrot the abortion arguments word for word, deed for deed.
If Onan didn't want to give his brother an heir, why marry his wife? Now we all know that that child would have been Onan's. It's biologically impossible for Onan to impregnant a woman with his brothers seed. This argument is so far out there.
OK, prove that any church doctrine, church father, or Christian wriiting of any kind before 1930 sanctioned the use of any method of birth control. PROOF!
Please tell me you are not comparing a surgery to save the life of a mother and/or her child is the same as getting fixed like a house pet!

That's not even apples and oranges, it's more like apples and white wall tires.