My objection goes beyond Sola Scriptura, it is the Infectus Scriptura of the Paulian heresy. They have elevated the works of St. Paul to be a final rewrite of the Revealed Word, having an importance and meaning that supersedes the words of Christ.
I've seen Kosta post very extensive lists of quotes from the Gospels that stress the importance of how 'works' are vital to our salvation, and each and every time the response is a quote from St. Paul to contradict that list.
I imagine their collective heads all cocked on an angle like a confused dog when they're presented with Kosta's list. If all the Bible is equally important, why do they always choose St. Paul over Christ whenever there's contradicting passages? Obviously they hold St. Paul in higher esteem than Christ. Again - that ain't Christianity. It's really time we stopped labeling it as such.