It's not so simple though. I know women who hold these views (because I had a religious upbringing), and they genuinely feel that the evil non-Christian world has sanctioned the killing of babies. They're not trying to control other people, they're trying to save children from mass infanticide. They feel extremely sad about all the babies killed and dedicate themselves to ending the murder.
The arguments against this position are usually technical ones about when a fetus becomes conscious and so on. I do think a lot of that misses the point. Firstly, we can't objectively decide when a baby becomes a human, because really this is a socially determined decision. Many cultures by practicing post-birth infanticide have essentially declared that someone is not a human until they are socialised as human. We find leaving babies out to die in the bush as shocking as anti-abortion campaigners find abortion. It's quite difficult to objectively declare that anyone is right on this. Secondly, the dislike of abortion among many women is deeply emotionally felt, so these arguments about when consciousness is achieved just cut no mustard at all. What they've done is prioritised their emotional feelings for innocent babies over their emotional feelings for women whose 'mistakes' make them less instantly lovable. And every person in Britain who finds dogs more lovable than people (quite a lot in my experience) is doing the same thing. It's quite easy to love 'innocence' over the messiness of human adulthood.
For the record I am in favour of the current guidelines in most developed countries for when a fetus/baby becomes a human, but to some extent it's a utilitarian decision about how best to reduce suffering. That seems very cold to some people, particularly if the preacher told them a human begins from when the sperm meets the egg. The preacher's intentions may well be about control, but I don't believe that's the main thing that causes anti-abortion feeling to propagate itself among women.