I do not believe the sons of God (In Gen. and Job) were angels nor did they mate with women. It somehow steals from the sovereignty of God. Even demons operate only within God's set boundaries. If Satan wasn't already fallen in Eden, why was he working against God. We need not discuss it further here.
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I believe it was part of Gods plan to allow satan to do what He did and to do what he will do in the future up until the time satan will be cast into the eternal lake of fire.. God allows satan to do what he does and his angels to do what they do to cause them to demonstrate to the Heavenly Host why satans claim to Godhood is false and why satan will fully deserve Gods judgement.. I believe God created this universe creation, Us included as a place where He could show by demonstration why satan cannot be equal to God and why God Himself can only be the one and only God of all existence..
I believe God wants to save both Angels and Humans who will follow Him and acknowledge Him and fully accept Him as being the only One who can be God of all existence.. Not simply because He is all powerful and could just Zap anyone who opposed Him out of existence,, because His creations could still see him as being unjustified in being the one and only God, they would only bow to Him because they would know that resistance would be futile against an all powerful Being..
So i believe God allows satan to make his claim to Godhood and to demonstrate within certain restrictions on earth why his claim is justified.. satans frist act was to sabotage Gods creation in the garden of Eden by enticing humans to take on board the knowledge of Good and Evil.. This he did to demonstrate to the heavenly host how he could wreck the creation of God and force God to destroy the now faulty creation and thus demonstrate his power in defeating what God created.. i believe satan thought that if God did not destroy the now faulty creation then God could not claim to be a perfect God because God would be allowing imperfection / sinful / evil beings to exist..
so satan thought he had God between a rock and a hard place.. But God foreknew every move that satan would make and already had His plan to justly Redeem His creation in a way that would defeat satans plans and show to the Angelic Heavenly host the awesome wisdom and love and justice of God through manifesting in the flesh and becoming the perfect sacrifice offering for the sins of all who would believe God..
I believe satan and his angels will be used as an implement of Gods wrath upon those humans who reject Gods loving gift of salvation.. when satan comes down he will be filled with great anger and he will go out with his angels and he will bring great suffering to those not covered by the protection of God in the end times..
So all the evil things that satan does along with his fellow fallen angels act to bring condemnation upon them all as well as great suffering upon those humans on earth who are in league with satan.. satan has no love for humanity and has contempt for those who serve him, in satans final days before he is cast into the lake of fire he will do as much as possible to bring suffering and destruction upon earth..
So satan has been working against God but the more he has worked the worse and worse has become his own position.. Like a gambler who loses a bet and keeps on doubling up trying to win back his losses satan has gone to more and more evil and desperate options to win and every time he does the more and more evil and unjustified he has revealed himself to be and the more glorious and awesome has Gods responses to satans actions become..
I see God allowing satan into the garden of Eden as God giving satan enough rope to hang himself.. satan took the bait and was doomed from the very start..