[Mad Dawg]

I THINK the "not allowing God's will" part can be seen to come to roost on or near the notion of"natural." (I'm being impressionistic here - duh- rather than addressing the jury.)

From our POV ABC involves the use of drugs or devices to impede or stop a healthful and natural process. NFP works with the natural process.

I have a friend who was using (insert menacing music here) "the Pill" and got pregnant anyway BECAUSE she was taking ampicillin. Who knew? Anyway, her husband and she called the fetus "Ampicillin" ("Ampy" for short) for the duration of the pregnancy. Somehow to me this highlights the bizarre nature of using a 'medicine' to prevent a benign natural process.

(But then I think Botox is perverse too.)

[allmendream]

Because compounds in the body are often metabolized by the same biological enzymes, taking two drugs at the same time will often reduce (or increase) the efficacy of one or the other of the drugs. (Drug Drug interactions)

In this case many antibiotics act to induce production of these metabolic enzymes, causing other substances, such as birth control hormones, to be metabolized much fater than expected, reducing their circulating plasma concentrations, and reducing their efficacy.