. . . the West article says it is ok to avoid getting pregnant if you're doing so for the right reasons, but goes on to make a distinction between "natural family planning" (basically, abstaining during certain parts of a woman's cycle), and contraception like condoms. The distinction is made by criticizing the pro-conception argument that abstention and contraception are the same because they have the same "end" (i.e., prevented pregnancy), as containing the same logical fallacy as likening miscarriage to abortion. The difference, according to West, is that "[Natural family planning or miscarriage] is an 'act of God.' In [the case of contraceptives or abortion] man takes the powers of life into his own hands and makes himself like God." West cites Genesis 3:5 in support. Genesis 3:5 is the verse where the serpent tells Eve she'll be ok if she eats the forbidden fruit because all it will do is open her eyes so that she, like God, will know the difference between good and evil. I fail to see how this passage supports the idea that using contraception would be making onself like God any more than abstention would.
Moreover, the miscarriage vs. abortion analogy is materially distinguishable (indeed, I think it actually helps illustrate how not different abstention and contraceptive use are). Miscarriage and abortion both end a life already in existence. In a miscarriage, the fetus may be miscarried whether its parents wanted that to happen or not. A fetus that is aborted, however, has been aborted because someone chose to abort it, and it otherwise may have lived. I think it is that active choice to end a life which brings humankind into the picture (rather than making it just an "act of God," as a one might view a miscarriage to be).
Abstention and contraception, on the other hand, both prevent pregnancy from ever occurring -- that is, they both disrupt the potential for life, not life itself. In one case, that potentiality is disrupted by a couple actively choosing not to have sex, thereby not letting any sperm near the egg. In the other case, the potentiality is disrupted by the couple choosing to have sex with a latex barrier . . . which doesn't let any sperm near the egg. What's the difference? That one is an "act of God" and the other isn't as the West article suggests? How? They both involve a couples' choice not to let sperm near the egg. The only difference is the method: latex (which allows for the sex part to happen) vs. no latex (which requires that the sex part not happen). Is the problem that condoms don't grow on trees or whatever so they're not "naturally" occurring "acts of God"?
Making arguments hinged on the potentiality for life are difficult because there's no logical difference for the well being of the "not-yet-created-embryo" when you're not having sex and when you're having sex with a condom on. The "not-yet-created-embryo" is not going to be hurt any more or any less by either method ...