Are you calling Luke 17:21 Gnostic Nonsense or did you only quote part of what the post said and calling that all nonsense?

Luke 17:21 agrees with what John Said along with OT Ezekiel and Paul about how your body is the temple of God.

I submit that the mansions are not physical houses but your body as a temple for God. A billion or so of people will be God's temple will be part of New Jerusalem.

Matt 21:42 Jesus saith unto them, Did ye never read in the scriptures, The stone which the builders rejected, the same is become the head of the corner: this is the Lord's doing, and it is marvelous in our eyes?

1 Peter 2:4 To whom coming, [as unto] a living stone, disallowed indeed of men, but chosen of God, [and] precious, 5 Ye also, as lively stones, are built up a spiritual house, an holy priesthood, to offer up spiritual sacrifices, acceptable to God by Jesus Christ.

Isaiah 28:16 Therefore thus saith the Lord GOD, Behold, I lay in Zion for a foundation a stone, a tried stone, a precious corner [stone], a sure foundation: he that believeth shall not make haste.