Did Paul really think his Jewish opponents saw themselves as being sinless?

Standard Protestant teaching says that the reason why works cannot justify us is "because we are sinners," which is another way of saying that if we were not sinners, then works could indeed save us. As I have noted elsewhere on this blog (e.g. here), Paul never suggests works could save even if we were sinless. In this post, I want to add another detail which goes against this Protestant idea, namely looking at whether the Jews ever considered themselves sinless. I will now turn to the Scriptures to show that the Jews clearly did consider themselves sinners, which thus totally undermines the Protestant Perspective on Paul.

As I was looking around for some Protestant quotes on this matter, I came across this gem from R.C. Sproul's ministry: 

God’s people were justified by faith alone under the Mosaic covenant even though some verses in the Law say the doing of its precepts brings righteousness and life. One of these is Leviticus 18:5, which Paul quotes in Galatians 3:12. We might conclude from a superficial reading of the Mosaic law that old covenant people were saved by works, not faith. Some Christians have held this position. However, the Torah shows us that while it reveals God’s righteous standard, our Creator knew that sinners could never save themselves by doing the Law. For example, the inclusion of sacrifices to atone for sin presupposes that the people will fail and have to look for another way to be justified.

The first sentence here says that under the Law people were justified by faith alone "even though" the Law says you are justified by works. How could the Bible say justification is by faith alone if it teaches justification by works? This claim is a blatant contradiction in thought, which is sadly so characteristic of the PPP. But that's not all! The quote also goes on to say that the Law included instructions on performing sacrifices to atone for sins, since it was obvious that nobody could be sinless. What Jew would go around considering themselves sinless when they were fully aware of the long chapters in Leviticus dedicated to instructions on atoning for sin? Why would God issue a Law that simultaneously demanded sinlessness and a means to atone for sin? Did a single Jew on the annual Day of Atonement, dedicated to atoning for all the sins of the Israelite nation, seriously think they were without sin?

The implicit Filioque?

As I was reading up on the first two Ecumenical Councils, I came across a fascinating tidbit of information from Protestant historian Philip Schaff's famous Nicene Fathers series. For those who don't know, the Nicene Creed we recite each Sunday actually came to us from two Ecumenical Councils. Basically, the First Ecumenical Council held in Nicaea in AD325 gave us the 'first half' of the Creed, up to the words "and we believe in the Holy Spirit," but stopped there. Later on at the Second Ecumenical Council held in Constantinople in AD381, we got the 'second half' of the Nicene Creed, which added everything including and after the words "and in the Holy Spirit, the Lord and giver of life, who proceeds from the Father". What is fascinating is that it turns out these Creeds were not just invented on the spot at these Councils, but rather they existed in a few different 'versions' and were basically used as a 'statement of faith' for one's Baptism. This is an important historical detail because it means that the Filioque - the part where the Creed says the Holy Spirit proceeds from the Father "and the Son" - despite not being part of the Nicene Creed of either the Council of 325 nor 381, should not be automatically taken as a rejection of the idea itself. Nor should having the Filioque clause within the Creed be taken as 'tampering' with the Creed. (I wrote about the Filioque taught in Scripture in an older post, if you're interested.)

The best testimony for this comes from a significant Early Church Father, St Epiphanius, Bishop of Salamis (Cyprus). He lived from AD310-403 and is held in high regard by both East and West. He lived during both Councils but he did not attend either, making his testimony even more significant. The passage from Schaff's series says that Epiphanius used a creed as early as AD374 (i.e. a decade prior to the Second Ecumenical Council), which none the less was nearly identical to the Nicene Creed as we know it. Epiphanius tells us that this was handed on from ancient times, even from the Apostles themselves, and that it is required knowledge to get Baptized. This means that prior to the Second Ecumenical Council in AD381, certain regions were already using a longer Creed than the one from AD325. Yet we would not say these regions were 'tampering' with the Creed, since they were expounding on it without changing its meaning.