The Holy Seasons of Lent and Easter provide a framework for preaching and teaching the pro-life message in the context of repentance and of the victory of life. Repentance is a changing of the mind, and with it one's life, away from the path of sin and toward a life of holiness. It is not possible to repent of a sin which one does not recognize or admit is a sin. During Lent, we ask to be delivered from such blindness, and to be forgiven even our hidden sins. I have heard numerous people declare that while they know abortion kills a child, they have no problem supporting it.
Easter celebrates the victory of life.
Christians do not come to Church on Easter simply to congratulate Jesus for rising from the dead. They come in order to touch their own victory over death. He overturned the entire kingdom of death. The influence of the Church on the world, therefore, is the influence of a community which already participates in victory over death. That influence moves the structures and choices of society away from death and destruction, and toward the affirmation, in word and deed, of the precious gift of life.