To justify Christian morality because it provides a foundation of morality, instead of showing the necessity of Christian morality from the truth of Christianity, is a very dangerous inversion.
It is good to remember that the goal of Buddhism is to create Buddhas, not Buddhists, as the goal of Christianity is to create Christs, not Christians. In the same vein, my teachings are not meant to acquire followers or imitators, but to awaken beings to eternal truth and thus to awakened life and living.
There are techniques of Buddhism, such as meditation, that anyone can adopt. And, of course, there are Christian monks and nuns who already use Buddhist methods in order to develop their devotion, compassion, and ability to forgive.