Barrier contraception or the contraceptive pill would be the answer to everyone's prayers, which is why I've never understood many religious establishments being against the whole lot, abortion, contraception, you name it. It's basically like saying 'women are baby-making machines and having sex purely for the pleasure of it is defying our will'.
God actually never emphatically stated an opinion either way, yes, there's the whole 'seed on barren ground' analogy, but, as has been noted before, this could mean about breeding within the same gene-pool. sharing the same wife would mean not spreading the seed of Israel into new 'soil' and therefore encouraging growth of the Israelite nation.
Personally, I don't think anyone should be forced to live up to what someone else believes, if they are against abortions and/or don't want one, great, they've saved themselves a trip to the clinic, if they want an abortion, then the service is there, and is as safe as such a procedure can be. Trying to force either side of the opinion to live according to the others' opinion will always leads to grief in one form or another. That said, abortion should be a last resort, not a first option.
That's why I think a forum like this is the worst possible place to discuss abortion, because forums are statistically male-dominated and somewhat misogynistic in opinion, that's no offence to anyone here, but simply an observable fact that happens when large groups of males are in the same place.