“Not really.”
Of course it’s from the Catholic prayer, the Hail Mary.
I’m sure you wouldn’t want to tell us where the expression comes from if it’s “not really” to prove your claim.
I meant that even if it started out at a Catholic uni as a reference to hasty prayers to the Blessed Mother for a win or goal or good tackle it certainly is not seen as such by the entire NFL. It has come to mean a last minute appeal against the odds for a victory. In the context of the NFL the meaning is secular.