However, initial salvation is apart from faith's necessary works (Eph 2:8-9).Can't it be both? Does not our salvation affect our lived-out life?
While the salvation of our lived-out life is sanctification, which is works of obedience in the Holy Spirit, which lead to righteousness leading to holiness (Ro 6:16, 19).
The Dead Sea Scrolls have provided us with a wealth of information about the Jewish culture at the time. It provides us with a background which can help us understand specific circumstances. It does not change the overall message of Scripture. It does not change the gospel message - through the death and resurrection of the Lord Jesus Christ we have forgiveness of sins. But it can change how we look at certain passages/phrases/words in the texts. But again, big picture, nothing changes.
Keeping in mind that the issue at the Council was two-fold: salvation (Ac 15:1) as well as membership in the people of God (Ac 15:5).Yes, in Galatians and Romans, Paul is arguing specifically against the need for the Gentiles to be circumcised, keeping kosher, keeping sabbath, etc, exactly what the Jerusalem council had decided in Ac 15:24.
The OP is not referring to the council of Jerusalem, it refers to all of Paul's teaching, where Abraham is Paul's example of righteousness apart from works (Ro 4:1-5) when there was no Mosaic law at that time. Abraham being the model of his doctrine, Paul has more than Mosaic laws in mind when he uses "works of the law," which phrase would be relevant to NT Jews whose only "meritoreous" works were the law.This is exactly what the NP is saying. The OP are making this more general works. Which of course is still true, but not what is being discussed in these specific instances.
While specifically I agree that it depends totally on the church/denomination you are in, I think the issue is a general problem in our western societies today which is very individualistic, expecially in these postmodernism times. I also agree that there is nothing preventing fellowship across denominations, and yet we are still very divided.