You’re not wrong that “spirit” in Scripture can mean invisible (John 4:24), but the move you’re making—“Jesus in spirit form ate with Abraham, therefore spirit‑beings can eat, therefore our resurrection bodies are spirit‑bodies that only appear physical”—breaks the text’s own categories, because Jesus Himself draws a hard line between a spirit and a resurrected body: “a spirit does not have flesh and bones as you see Me have” (Luke 24:39).
He doesn’t say “a spirit doesn’t need flesh and bones,” or “a spirit can manifest flesh and bones,” but “a spirit does not have flesh and bones,” and then He proves He has them by eating fish (Luke 24:42–43) and showing wounds (John 20:27). Genesis 18 never says the Lord and the angels were in “spirit form” when they ate with Abraham; it simply says “three men stood by him” (Gen 18:2), and Abraham treats them as physical men—washing feet, preparing food, watching them eat.
Nothing in the text calls their bodies illusions or manifestations.
And resurrection is never described as “spirit‑form”; Paul says the body is raised (1 Cor 15:42–44), changed (1 Cor 15:51–52), redeemed (Rom 8:23), and made immortal, not replaced with a spirit‑body.
So the biblical pattern is: spirits are immaterial; angels can take physical form when God wills; but resurrection is permanent glorified human embodiment, not spirit‑mode with optional physical manifestation.
But we know in Genesis 18:2 that the "three men stood by him" weren't men in the flesh that we have. They were Jesus and two angels. They weren't in the same flesh that we as humans have today.
Maybe A.I. can describe this to you better so you'll understand what I'm saying:
The Lord and the two angels disappeared from Abraham and Lot after their respective visits, departing to different locations to fulfill their distinct roles in the narrative of Genesis 18 and Genesis 19.
After visiting Abraham at the oaks of Mamre, the group split: two angels continued toward Sodom to investigate the city and eventually rescue Lot, while the Lord remained with Abraham to discuss the fate of the cities before departing to heaven. The text notes that after the Lord finished speaking to Abraham, He went His way, and Abraham returned to his place.
Later, the two angels arrived at Sodom in the evening. After being hosted by Lot, they forcibly extracted him and his family from the city. Once Lot was safely outside, the angels disappeared from his sight as the Lord rained down fire and brimstone from heaven to destroy Sodom and Gomorrah, with Lot and his family fleeing to the mountains.