As far as I can tell, the Bible doesn't explicitly get into birth control or contraception. Yes, there's the Onan account in Genesis 38, but that seems more focused on Onan refusing to produce a descendant for his brother than on what Onan actually did physically. What I do see throughout Scripture is the idea that children are a blessing from God. Psalm 127 tells us, "Happy is the man who has a quiver full of them." All over the Bible, people are told to multiply, and women seem to want children more than anything. A closed womb is considered to be like a curse in the Old Testament.
We're in a culture now where people with large families (especially Mormons, Catholics and some of the more conservative evangelicals) are viewed as abnormal. In some circles you're even viewed as being environmentally irresponsible if you have too many kids. What's wrong with this picture? Have we really fallen this far? Is it possible that the whole overpopulation thing we're always hearing about is really a myth? Do we have the pill to blame for the sexual revolution? Is Al Mohler right?
Perhaps God "tolerates" birth control because of the hardness of our hearts. (Or perhaps he doesn't tolerate it at all- we could be just kidding ourselves.) I'll admit, when I think about birth control compared to abortion, birth control seems to be the lesser of two evils. And like California to a Republican, or Texas to a Democrat, we Christians have all but conceded sexuality as the "state we'll never win". Many of us don't even bother making it a battleground anymore. Birth control is easier than self-control, frankly. Our libidos have become our gods, and most of us don't even realize it. That's usually the way slavery works.One day, we may look back to May 9, 1960 as the date when Pandora's box was opened.