The Church is not a building of stone, or made with hands; it is [a] Believer[s] that has a Revelation of just Whom Christ-Jesus is. Apostle-Peter in training answered the question correctly: Who do you say that I Am? "Thou art the Christ the Son of the Living GOD. Christ said that flesh and blood did not reveal this information, but My Father; via the Holy Spirit.
Thou art the Christ, the Son of the Living GOD = Immanuel. Christ is considered the Son, because He was born of water - via a woman: making Him legal: unlike fallen angles, who are dead-spirits-talking.
The old Temple-system is dead [Veil torn, Matt.27:51]. We are the "many mansions" that Christ spoke of. "The Kingdom of Heaven - on earth, is inside of us: between our ears and eyes. "This rock" refers to Peter's confession: the one that we all must make. Our Confession/Belief/Faith [Heb.11:6] is the foundation to please the LORD.
Matt.18:19,20 - "Where" - two or three are gathered together, in MY name, there Am I [Christ-Spirit] in the midst of them. These are the ones that Immanuel-Christ-Jesus will "meet" with first, when we are all converted to our Spiritual-Bodies.