Invisible! The kingdom of God is invisible to a person without the Holy Spirit. Without the Holy Spirit a natural person can’t even find the door.
Even if a natural person were to use a microscope or binoculars, or a telescope they could not see the kingdom of God.
Here is a clue, Jesus is the door.
Whatever happens don’t leave earth spiritually blind.
John 10:9 English Standard Version (ESV)
9 I am the door. If anyone enters by me, he will be saved and will go in and out and find pasture.
John 3:3 English Standard Version (ESV)
3 Jesus answered him, “Truly, truly, I say to you, unless one is born again he cannot see the kingdom of God.”
John 3:5-6 English Standard Version (ESV)
5 Jesus answered, “Truly, truly, I say to you, unless one is born of water and the Spirit, he cannot enter the kingdom of God. 6 That which is born of the flesh is flesh, and that which is born of the Spirit is spirit.
Romans 10:9-13 English Standard Version (ESV)
9 because, if you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved. 10 For with the heart one believes and is justified, and with the mouth one confesses and is saved. 11 For the Scripture says, “Everyone who believes in him will not be put to shame.” 12 For there is no distinction between Jew and Greek; for the same Lord is Lord of all, bestowing his riches on all who call on him. 13 For “everyone who calls on the name of the Lord will be saved.”
A disciple moment with the Lord:
Listen: What is God saying?
Obey: What will I do with what God is saying?
Go: To whom will I take this message?
Glorify: How was God glorified in my obedience?