The apostle Paul was just as much a victim of the deceptions of Satan as we. He, too, had to have the "scales" lifted from his eyes, so he could see the truth of God.
Now that sums it up, I think, about as well as any series of verses in the entire Bible. We cannot trust the record—the tradition—of the Jews in regard to spiritual things because they were just as unconverted as we were.
So, we see a summation here in Romans 10:1-3, that the Jews are not to be trusted any more than any other people in regard to spiritual things. They had erected a system of worship that is called Judaism; and, oh, it was strict. Oh, they were zealous for it; and, oh, it was done in the name of God (just like "Christianity" today). But this religion was in agreement with their own character—not the mind of God! We have just seen the witness of that in God's Word. They were not in agreement with God. Some were doing things right, but the vast majority were not—even as it is today.
There is no doubt that the Jews were a religious people. There is no doubt that they were attending synagogue. There was no doubt that they were looking into things in the Bible. There was no doubt that they were talking with one another—even as people today, in this nation, talk to one another about religion. They go to church on Sunday, or on Sabbath, or maybe on Friday. We are a reasonably (or, fairly) religious people; but I think that you would have to agree with me that it is not according to knowledge. Same thing with the Jews back in the time of Christ, back in the time of the apostle Paul, and both before and after those times, as well.