It is remarkable that Paul, who writes so beautifully and compellingly about the sufficiency of Christ's sacrifice would later make a statement like this.
I like to say that in Faith in which "One" (as in "one God") doesn't mean what the average person thinks it means, "Complete" may have some surprises as well.
Now I just don't think name calling and perseveration leads to any good thing. So if you want to fight about religion, I am NOT your boy. If you want to talk about it as brethren seeking some common ground, that's another story.
I happen to agree with you. Christ's sufferings and atonement on the cross is complete, its sufficient, and He said, 'It is finished'.
This is precisely why it is so utterly repugnant to seek to add anything to His finished work. To claim the cross + anything makes the cross a mockery. And it makes the cross insufficent in direct contradiction to your above statement when you seek to add sacraments, and ordinances, and decrees, etc. etc. to salvation.
I am also not seeking to 'attack' anyone's religion. I am seeking to present what Scripture says. If you want to believe Mary is 'Queen of all things' and is a co-Savior knock yourself out. I am simply presenting the fact the Scripture does not teach that. (BTW: This thread was an 'attack' on those who believe in Sola Scriptura so its a matter of viewpoint who is attacking whom here).