To be in heaven is to be a habitation of God (through the Spirit and the name of Jesus) which comes down from the heavens to be established eternally here on earth.
Ephesians 2
6
And hath raised us up together, and made us sit together in heavenly places in Christ Jesus:
7 That in the ages to come he might shew the exceeding riches of his grace in his kindness toward us through Christ Jesus.
18 For through him we both have access by one Spirit unto the Father.
19 Now therefore ye are no more strangers and foreigners, but fellowcitizens with the saints, and of the household of God;
20
And are built upon the foundation of the apostles and prophets, Jesus Christ himself being the chief corner stone;
21 In whom all the building fitly framed together groweth unto an holy temple in the Lord:
22 In whom ye also are builded together for an habitation of God through the Spirit.
Rev 3:12
Him that overcometh will I make a pillar in the temple of my God, and he shall go no more out: and I will write upon him the name of my God, and the name of the city of my God, which is new Jerusalem, which cometh down out of heaven from my God: and I will write upon him my new name.
We are now seated with God in heavenly places.
THE CHURCH IS HEAVEN ON EARTH!!!!
And if that isn't enough to make you want to shout and run the aisles . . .
Matthew 24:14
And this gospel of the kingdom shall be preached in all the world for a witness unto all nations; and then shall the end come.