is a specific kind of: theological system, theology.

is a broader term that covers: Christology | Jesuitism, Jesuitry | patristics, patrology | polemics | soteriology.

has as a part: Nativity, Virgin Birth.

domain member category: free grace, grace, grace of God | Advent, Parousia, Second Advent, Second Coming, Second Coming of Christ | agape | grace, saving grace, state of grace | consubstantial.