Birth control pills do not "kill" babies. I am against abortion too, but refusing to allow birth control is patently STUPID.
If you believe life begins at conception then yes birth control pills do kill babies. While the pill is supposed to prevent ovulation it is not 100% effective and occasionally ovulation occurs and an egg is fertilized. Progestin one of the birth control hormones prevents such a fertilized egg from implanting in the uterus.