It would be interesting to see if Jacob's experience at Bethel is anywhere described as an 'adoption.' So too with respect to a specific commemorative date in the liturgical calendar. For the moment at least it is worth noting that we aren't even close to fully understanding Marcionite redemption. The major task at hand for us is to explain how Jesus's crucifixion = the redemption. In the words of Adolf von Harnack:
This much, however, is unmistakable, that Marcion succeeded in placing the greatness and uniqueness of redemption through Christ in the clearest light and in beholding this redemption in the person of Christ, but chiefly in his death upon the cross.
I am presently working on a paper on our discoveries with respect to Marcionite redemption. The missing piece here however is massively significant. Anyone who can understand why crucifixion should 'redeem' humanity (= transfer it from the just Lord to kind God) is smarter than I am right now. It is the ultimate question in the study of early Christianity.