Righteousness does not come from obedience, righteousness comes from faith which leads to obedience.  They may look the same on the outside, but the innards are worlds apart!  Their “delight” in verse 2 is not genuine as they attempt to use their religious behavior as a tool to pressure and manipulate God to get what they want.  But their real delight is in God’s good gifts, not in the Giver of the gifts.  Their false piety is apparent by their oppression of their workers, fighting and bickering.  Our obedience is never a director of God’s favor; it is a reflection that we have already received God’s favor – their is a huge difference.

““Cry aloud; do not hold back; lift up your voice like a trumpet; declare to my people their transgression, to the house of Jacob their sins. Yet they seek me daily and delight to know my ways, as if they were a nation that did righteousness and did not forsake the judgment of their God; they ask of me righteous judgments; they delight to draw near to God.
‘Why have we fasted, and you see it not? Why have we humbled ourselves, and you take no knowledge of it?’ Behold, in the day of your fast you seek your own pleasure, and oppress all your workers. Behold, you fast only to quarrel and to fight and to hit with a wicked fist. Fasting like yours this day will not make your voice to be heard on high. Is such the fast that I choose, a day for a person to humble himself? Is it to bow down his head like a reed, and to spread sackcloth and ashes under him? Will you call this a fast, and a day acceptable to the LORD?” (Isaiah 58:1–5 ESV)