A favorite verse used by pro-life advocates to exhort the Church to action on behalf of the unborn is Proverbs 31:8:
"Speak up for those who cannot speak for themselves, for the rights of all who are destitute."
Christians should see this verse as a command to engage in pro-life advocacy on some level. While Proverbs 31:8 isn't specifically talking only about abortion, there is no getting around the fact that the unborn cannot speak up for themselves. There is no larger group of people so utterly incapable of speaking on their own behalf than the unborn. We have the privilege and obligation to speak up for these little ones. God commands it and there is no ignoring Him. If that were the end of the story, that should be enough for us because the creator of the universe has spoken; but to isolate Proverbs 31:8 is to forget the larger narrative of scripture and how the Gospel functions as our lens to interpret scripture.