Let’s try again, then. It seemed that you were making a claim about Satan being in heaven, and in support of that claim, you quoted Jesus (“I saw Satan fall like lightning from heaven”) in Luke 10:18.
I pointed out that Luke 10:18 doesn’t claim that Satan’s in heaven. Rather, it’s a figure of speech: Jesus says that he has seen Satan fall (as the result of the mission of the 72). He compares it to the way that lightning falls from the sky. It’s not an assertion about Satan in heaven; it’s a description that calls upon something we can identify with: we’ve all seen lightning arc from the sky to the earth, as if it’s falling. That’s what Jesus is saying here. It’s not a discussion of the fall of angels.