I read Brandon C. Jones’ comments several days ago and have re-read them several times. I appreciated your post and found it thought-provoking. I must confess I am still not comfortable, as a Baptist, with us using the word “sacrament”. Let me interact with some quotes from you as I explain why.
To be sure, some people may think that the word itself involves some sort of "saving efficacy" as you put it, but that is not what the word means or why the church employed it in the past.
The church in the past has not had a uniform meaning for the word and that is part of the problem with using it. Use of the word can and does become a point of confusion. From about the fourth century on, the word HAS been connected with “saving efficacy”. I have no doubt that this is a corruption of the original intent of the word, but it is a corruption that became dominant and arguably connects the word “sacrament” with saving efficacy through sacerdotalism. So, I have trouble using the word because of the historical misuse of it. That's too bad in a way, but ultimately, word meaning is based upon usage.
The word comes from "mystery" and if I recall it precisely means an outward sign (or symbol if you like) of an inward grace.
I do not believe that, for instance, the bread of which we partake in communion is merely an outward sign of an inward grace. To say this is to grossly understate the meaning of the bread. The bread is a finite, comprehensible symbol of infinite, incomprehensible grace. Because grace is infinite and incomprehennsible, the bread does not contain grace. It does not give grace, nor could it. God’s grace is far too infinite to be actually contained in the bread and the grace we need is far too great to be contained in the bread.
...partaking of the Lord's Supper and Baptism and how the experience of performing these acts give the person some grace by participating in them
I find the order in this statement to be troubling. The order, if I understand what you are saying is, we partake of the bread, then we receive grace. In actuality, we have already received grace at salvation. The means of receiving grace is faith. The grace we have already received now motivates us to fellowship with Christ in celebrating his death and resurrection and in anticipating his return. Your paradigm seems to be: do the obedient act of eating the bread and receive grace. I believe the proper paradigm is: You who have received grace through faith, joyfully enter into the fellowship meal.
So for me, "sacrament" does not seem to be a fitting word to describe the elements in the Lord's table.