Aimee Milburn wrote a great article on why one does not need to be religious to be pro-life. She shows how the original feminists were very anti-abortion because in their minds it was abortion that subjugated woman. She chronicles the lies that had to be spread during the sexual revolution to change the hearts of feminists from pro-life to pro-choice. She contrasts the pro-life movement with other basic human rights struggles and their resolution. It's a good read that only takes a few minutes. It can be useful for when people come back with "don't impose your religious beliefs on me" mindsets.