Respect for human life is basic to the definition of Christian identity.1 To recognize the infinite value of every human individual is essential to all Christian morality, whatever its formulation. Recognizing this value is the very condition for participating in Christian morality. It's not a question of a choice left to each one's discretion within the Christian ethic. This truth, objectively established, is essentially the gateway to the whole of Christian morality.
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1 This thesis has been masterfully explained by Jean-Marie Hennaux, Le droit de l'homme à la vie, de la conception à la naissance (Brussels, Ed. de l'Institut d'Etudes Théologiques, 1993).
CBCP PASTORAL LETTER: "LOVE IS LIFE" (1990)
http://www.cbcp.net/documents/lovelife_90.html