Isaiah (whose name means “God saves”), lived through the reign of 4 Kings (1:1). He began his ministry in 740 BC, the year King Uzziah died (6:1).
The people in Isaiah’s time had arranged their life in 2 separate boxes marked “religion” and “life.” They were good at celebrating the temple rituals but their practical faith stopped at the temple gates. They ignored the poor and the widowed, the neglected and the vulnerable
Serving God and following His call involves many choices; one of them isn't the distinction between "faith" and "life" - the two go together. When they are separated, as they were in Isaiah's day, it becomes more about us than it is about God. This ultimately brings judgment but that's not God's intention from the beginning - with Him there is always a way back.