While the majority of people in the pro-life movement in America are Christians, they cite their faith as the main reason of their opposition to abortion, The Bible itself never had a pure track record for being pro-life for the unborn. In the Book of Numbers, there is a trial called the ordeal of the bitter water. In the story, basically any wife that is questioned of being unfaithful drinks the water of bitterness. If said wife is guilty, the water causes her pregnancy to end.