God treated humanity and the angels is an obvious different way. With the angels they all decided from their own will, to follow God or to rebel. With humanity, God gave the choice to one federal head for all mankind, Adam.
All humanity, being in Adam, and not yet existing, in that sense sinned in him and contracted the penalty of eternal damnation. God made what is called the covenant of works with Adam, so he lost or earned heaven from his own works.
Now although men born from Adam were born with his guilt, their very sins, punishment for his sin, yet they had no choice in rejecting God, as they were born into a state of rejection, or rather being rejected in Adam.
Romans 5, ESV
18 Therefore, as one trespass[f] led to condemnation for all men, so
one act of righteousness[g] leads to justification and life for all
men. 19 For as by the one man's disobedience the many were made
sinners, so by the one man's obedience the many will be made
righteous.
God is his own free and sovereign perfections, chose, not because he must out of righteousness (as though someone could say what God must do!) but because of his own and only perfectly free will, chose, to manifest the glory of his person, to provide redemption for this lost humanity. In so doing, he also provided a means that each soul as they are born, have an opportunity to choose for themselves, life over death. If elect to do so.
To the angels, having all had a choice, and making their choice manifest to the rest, publicly, God’s glory was maintained in their immediate separation from his presence, forever. For those he chose to save from mankind, having mercy to who he will have mercy, he had to take upon himself their nature, die in their place and live a righteousness life, to impute perfection to them, while they were still unable to obey God, or will any good, still being subject to eternal death and having no more ability to do good than the demons.
The only difference therefore between men and angels is that God judged all mankind based on one man, Adam, into hell, and based on one man Jesus, judged hellish sinners into heaven. No human entered hell or heaven based on their own works but their own choice in receiving life. This choice was over a long period of history to manifest God’s perfect judgment for each one. In other words, angels and humans are not judged differently for the type of sins but from a different type of covenant administration with them.
Regarding all sins being the same. Well all sins in some sense are equally sinful, in that they all deserve eternal punishment, yet the degree of those sins may be greater as they grow within a sinners heart. Nevertheless, in terms of the general salvation of eternal life or eternal torments it’s rather irrelevant, or at least much less worthy of mentioning. All that matters is that Christ is believed and held onto, in order not to suffer those torments and to enter eternal glory.
Regarding blasphemy of the Holy Spirit, that is simply rejecting Christ while under ‘the immediate convincing presence of the Holy Spirit’ convincing the mind to recognize Christ’s credentials. If a man rejects Christ, at the very moment that their opportunity to receive him is at its height, how could they be saved? They have rejected the only means of salvation.
Luckily for most blasphemers and wretched sinners who reject Christ, like the Apostle Paul himself before conversion, they have not yet had the Holy Spirit fall upon them to reveal his excellent glorious grace and his wonderful sovereign will.
Just as God manifested his awesome glory in creation that makes most people want to keep living even in this hellish world, so in his new creation in Christ where he restores everything his glory is manifested to unspeakable heights. When a person enters into this grace and forgiveness, they can’t help but sing his praises in heartfelt gratitude and joy.
Come! Taste that the Lord is good. None have ever regretted it.
