The phrase "advent point" is not correct and does not appear to be a standard expression in written English.
It is unclear what context you intend to use it in, as it does not convey a recognizable meaning.
Example: "The advent point of the discussion was when we started addressing the main issues."
Alternatives: "starting point" or "initial stage".
This passage from Luke for the Second Sunday of Advent points to competing world views.
Currently I'm preaching through the alphabet as an Advent series, helping point every aspect of Christmas to its reason for being.
Indeed the gap in the bottom half of the table is the smallest it has been at this stage of the season since the advent of three points for a win in 1981-82.
The incidence of PDPH has been reduced significantly with the advent of pencil-point needles.
His is also the first Juventus side since the advent of three points for a win to claim the title with four games left to spare.
He describes cubism as being somehow an artistic response to the advent of cinema, pointing out that "a painting can't turn" and observing that "if you look closely at some of the portraits from cubism at the time, you'll find a portrait of a woman that is really a projector".
The advent of CGH points an ever-increasing number of chromosomal amplifications in various tumors.
Michael Twyman writes "The advertising blotter, effectively a desk-top trade card and year-round promotion piece, remained in general use until the advent of the ball point pen, which in the period 1945 to 1960 progressively replaced the steel rib and liquid inks" (Encyclopedia of Ephemera, 2000).
Writing in the journal Climatic Change, Mark Jacobson, an atmospheric scientist at Stanford University, and other researchers report that rerouting planes around the Arctic Circle could help delay the advent of a tipping point after which the ice would eventually disappear.
Statistically, scoring is down; Division I teams are averaging 69.9 points a game, the fewest in 18 seasons since the advent of the 3-point line.
