You can rationalize all you want.
The Bible does not use the phrase "sacred space". It does not convey the correct image of redemption. Nor do I get an image of God and man in an intimate relationship. In short, it's a lousy phrase, IMO.
The scriptures do indicate a physical location for Zion, Mount Zion, Jerusalem, Beulah, Promised Land, etc. These locations do not refer to a generic assembly of future believers.
I never mentioned pagans or gnostics, so I don't know why you are bringing that up with me. I will say that yes, "sacred space" sounds, new-agey and so I would never use the phrase.
God's redemptive plan is to destroy evil and rescue humanity from their sinful state through Jesus, his son. The plan is not to assemble us together somewhere spiritually so we can sing Kum Ba Yah.
Is it not through, the redemptive plan, that God the Father through Jesus the Son of God, destroys the evil one and his works?
Hebrews 2:14 ἐπεὶ οὖν τὰ παιδία κεκοινώνηκεν σαρκός καὶ αἵματος καὶ αὐτὸς παραπλησίως μετέσχεν τῶν αὐτῶν
ἵνα διὰ τοῦ θανάτου καταργήσῃ τὸν τὸ κράτος ἔχοντα τοῦ θανάτου τοῦτ᾽ ἔστιν τὸν διάβολον
that through the death he might destroy him that had the power of the death, that is, the devil;
The Son of God, born of woman, had to die and then be given the promised hope of God, eternal life, by the Father to destroy the Devil and his works including the death?
Rom 8:11 But if the Spirit of him that raised up Jesus from the dead dwell in you, he that raised up Christ from the dead shall also quicken your mortal bodies by his Spirit that dwelleth in you.
Gal 1:1 Paul, an apostle, (not of men, neither by man, but by Jesus Christ, and God the Father, who raised him from the dead;
John 5:21 first part. For as the Father raiseth up the dead, and quickeneth
John 5:26 For as the Father hath life in himself; so hath he given to the Son to have life in himself;
1 Cor 15:17 And if Christ be not raised, your faith
is vain; ye are yet in your sins.