Their logic is on CRACK. "You shouldn't use birth control because it impedes God's plan, since he can't get through the margin of error in condoms and pills, so you should just stay abstinent because it's 100% effective, except for that one time we base that entire religion on when God impregnated a virgin and gave her a choice, but just for the record you won't be getting a choice when it comes to your reproductive rights any other way."
Taken from
apocalypsos in this thread.