the religion based on the life and teachings of Jesus Christ and the Bible
Christianity is a religion claiming that the life, death, and resurrection of Jesus of Nazareth are the most complete revelation of the nature of God, and that the actions of Jesus were the actions of God and are a means by which individuals can know themselves to be accepted as God's children and become members of the Church — Professor John Rogerson
conformity to the Christian religion, or a branch of it
I do not ask whether this is Christianity or morality, I ask whether it is decency — Thomas Paine