Angels do not have full knowledge, but have wonderment at God's workings, while they were tested as they are free moral agents.
The devil as the first rebel against valid authority engaged in the first "occupy movement," that of the throne of God, ("I will be like the Most High"), making the first "share the wealth" demand, that God share His power and omniscience, working to persuade Eve that she was a victim of Divine selfishness (God's law is preventing you from being like Him), and had a welfare right to what was not hers (victim-entitlement mentality).
The devil, acting as one embittered by unjust treatment, seeks to persuade others to adopt a victim-entitlement mentality and rail against the God of the Bible, and or worship false gods that are in fact a distortion of Him and His justice and mercy which find their reconciliation in the cross of Christ.
In contrast to the selfish lust of the devil, in God's kingdom, in addition to salvation by unmerited grace, rewards are earned (by grace), so that he/she that overcometh him will Christ grant to sit with Him in His throne," (Revelation 3:21) and shall know as even also they are known. (cf. 1Cor. 13:12; 1Jn. 3:2)
Now you know where the liberal ethos comes from, as well as the atheist's rage against God.
What we modernly refer to as liberal ethos is a particular, ostensibly altruistic (but actually power hungry and selfish) jag of our age, which bears every sign of being spiritually egged on. Earlier usage of liberal, which survives in the term liberal arts, meant a degree of freedom to explore within firm but still fairly spacious outer bounds with the goal of finding truth and beauty. Now that has been turned into a farce and the point seems to be to twist what had been “bounds” into whatever gets giggles at the moment.