What seperates Christianity from every other religion is -- God entering the heart of a person and changing him from the inside out.
It is God's love, grace and presence that pushes a person to great transformation, great sacrifice and great works.
It is God's purpose to create a family of disciples. Disciples are people who connect with God through his love, grace and presence. That love, grace and presence are injected into the heart DNA of the person. That injection produces transformation -- and the family expresses God to the world. It is God's love and grace shown in his family that convinces people to change allegiance and join God's family.