We don't go to heaven as a spirit as you suggest. According to Paul we are resurrected and if we aren't resurrected, we are without hope.
I don't know if that's true. Here are the biblical reasons why I disagree with you:-
Paul taught that all who dwell in Christ are already spiritually in heaven, where He is:
"(God) hath raised us up together, and made us sit together in heavenly places in Christ Jesus" (Ephesians 2:6).
"Blessed be the God and Father of our Lord Jesus Christ, who hath blessed us with all spiritual blessings in heavenly places in Christ" (Ephesians 1:3).
Jesus promised the following reality for those who believe in Him:
"Do you not believe that I am in the Father and the Father in Me? The words that I speak to you I do not speak of Myself, but the Father who dwells in Me, He does the works. Believe Me that I am in the Father and the Father in Me, or else believe Me for the very works themselves." (John 14:10-11).
"Yet a little while and the world does not see Me any more. But you see Me. Because I live, you shall live also. At that day you shall know that I am in My Father, and you in Me, and I in you." (John 14:19-20).
"Dwell in Me, and I in you. As the branch cannot bear fruit of itself unless it remains in the vine, so neither can you unless you dwell in Me." (John 15:4).
"Therefore what you heard from the beginning, let it dwell in you. If what you heard from the beginning remains in you, you will dwell in both the Son and in the Father. And this is the promise that He has promised us: everlasting life."(1 John 2:24-25).
So in reality, Paul could teach that "(God) hath raised us up together, and made us sit together in heavenly places in Christ Jesus" (Ephesians 2:6).
"Blessed be the God and Father of our Lord Jesus Christ, who hath blessed us with all spiritual blessings in heavenly places in Christ" (Ephesians 1:3).
While Paul was still alive, he wrote a letter to the Christians in Philippi, expressing the desire (concerning these Christians and this church which he established), that he
"shall be ashamed in nothing, but as always now Christ shall be magnified in my body [soma] with all boldness, whether it is by life [zoe] or by death [thanatos]." (Philippians 1:20).
Then Paul implied, without any ambiguity, that those who die dwelling in Christ remain in Christ after death, when he added,
"For to me to live [záō] is Christ, and to die [apothnesko] is gain. But if I live [záō] in the flesh [sarx], this is the fruit of my labor.
Yet I do not know what I shall choose. For I am pressed together by the two:
having a desire to depart and to be with Christ, which is far better. But to remain in the flesh is more needful for you." (Philippians 1:20-24).
In another letter, written to a different congregation of Christians in another place, Paul wrote,
"For we know that if our earthly house of this tabernacle were dissolved, we have a building from God, a house not made with hands, eternal in the heavens. For indeed in this we groan, earnestly desiring to be clothed with our dwelling-place out of Heaven; if indeed in being clothed, we shall not be found naked.
For we who are in this tabernacle groan, being burdened; inasmuch as we do not wish to be unclothed, but to be clothed, so that the mortal might be swallowed up by the life.
And He who has worked in us for this same thing is God, who also is giving to us the earnest (guarantee) of the (Holy) Spirit. Then being always confident, knowing that while we are at home in the body, we are away from home from the Lord; for we walk by faith, not by sight; then we are confident and we are pleased rather to go away from home out of the body, and to come home to the Lord.
Therefore we are also laboring to be well-pleasing to Him, whether at home or away from home." (2 Corinthians 5:1-9).
Those who fall asleep in Christ are clothed with Christ's immortality, who alone is immortal (1 Timothy 6:16).
Nevertheless, until their own bodily resurrection, those who have died in Christ will not be found in a body (the way Jesus is), but Christ is risen.