Christ is the ultimate seed but not the only seed, no more than the Serpent had only one seed. Is not the devil the enemy of all God's people to this day!?
And while no one is ever spoken "as in Eve", neither does scripture teach that it's perfectly okay to be in Adam -- after all...all in Adam DIE (1Cor 15:22) -- contrast that with all in Christ LIVE!
It boggles my mind that so many here seem to think that it's perfectly okay to be contrasted with our Redeemer and Savior. Maybe it's a kool fad that has never lost its veneer? I for one would never want my life characterized as being being the polar opposite of Jesus'.
Satan, as part of God's divine counsel, had limited access to God after He DROVE him out of heaven! But that access doesn't mean that he entered back into heaven itself, or more specifically in to the highest heaven which is where God dwells. And of course, all access to God in the heavenly realm ceased after the Cross because Satan no longer had any legitimate legal complaint against against God's elect, since Jesus satisfied God's perfect justice.
Also, there is this:
Ps 15:1-5
15:1 A psalm of David.
LORD, who may dwell in your sanctuary?Who may live on your holy hill?
2 He whose walk is blameless and who does what is righteous,who speaks the truth from his heart 3 and has no slander on his tongue,who does his neighbor no wrong and casts no slur on his fellowman, 4 who despises a vile man but honors those who fear the LORD,who keeps his oath even when it hurts, 5 who lends his money without usury and does not accept a bribe against the innocent.
He who does these things will never be shaken.
NIV
Or this....
Ps 24:3-6
3 Who may ascend the hill of the LORD?
Who may stand in his holy place?
4 He who has clean hands and a pure heart,
who does not lift up his soul to an idol
or swear by what is false.
5 He will receive blessing from the LORD
and vindication from God his Savior.
6 Such is the generation of those who seek him,
who seek your face, O God of Jacob.
NIV
I get the feeling that Satan wasn't exactly renting a mansion in heaven between the time he was driven out and the Cross of Christ.