Brother the word "heaven" is use abstractly in greek to mean anything above the earth, as “cielo” in Spanish.
It can refer to the place where God is as in several verses you described, but also, the place were the stars are as in:
"[1Co 15:40 NASB] 40 There are also heavenly bodies and earthly bodies, but the glory of the heavenly is one, and the [glory] of the earthly is another."
Eph 6:12 is referring to the place where the clouds are (the atmosphere), as we know in what level the devil moves: “in which you formerly walked according to the course of this world, according to the prince of the power of the air, of the spirit that is now working in the sons of disobedience.”
EPHESIANS 2:2 NASB
This can be described as the three heavens as suggested in "[2Co 12:2 NASB] 2 I know a man in Christ who fourteen years ago--whether in the body I do not know, or out of the body I do not know, God knows--such a man was caught up to the third heaven." If the third is the one where God is, then the first is where the clouds are (or atmosphere) and the second where the heavenly bodies are (stars, sun, moon).
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