my·thol·o·gy noun \mi-ˈthä-lə-jē\ plural my·thol·o·gies 1: an allegorical narrative 2: a body of myths: as a : the myths dealing with the gods, demigods, and legendary heroes of a particular people b : mythos 2 <cold war mythology> 3: a branch of knowledge that deals with myth 4: a popular belief or assumption that has grown up around someone or something : myth 2a <defective mythologies that ignore masculine depth of feeling — Robert Bly>
There is an interesting usage of the term ‘mythology’ slung about when discussing fiction. It is used as something of a blanket term, referencing the stories and rules laid out in a particular continuity, encapsulating the world building and plot events that shape the way the world of the story is able to function. There is the more common understanding of mythology. Gods and heroes, their trials and deeds, wrapped in iconography, the trappings of reverence. Then, sometimes, there are instances where it means a bit of both.
Using the visual shorthand of the stained glass window to suggest the mythologized nature of the characters and events of the Terminator film, this illustration draws the connection between the internal world building mythology of the Terminator continuity, and the mythologizing of the represented characters as legendary figures within their world, that are again mythologized as media icons in our world.
Also? Establishing Sarah Connor as the mother of the savior figure grants automatic myth status and just begs for vaguely biblical interpretations.