what makes you think that angels can not get killed? they are not god
Yes, angels are not God.
"I saw Satan fall like lightning from heaven" (Jesus . . . in Luke 10:18)
So, God who is almighty has power to throw Satan at the speed on lightning . . . away.
So, God is not impressed by Satan and the problems Satan's evil spirit causes in us > yes, there is "the spirit who now works in the sons of disobedience" (in Ephesians 2:2).
We see in the Gospels what problems demons caused in people they possessed, including major medical trouble. But > Jesus says He cast them out, "with the finger of God" > Luke 11:20. So, from this, I see, how all God needs to cast a devil out of a person is His little pinkie
"Therefore submit to God. Resist the devil and he will flee from you." (James 4:7)
So, yes we humans, too, can make Satan flee from us. But first there needs to be submitting to God . . . personal submission, I understand this to mean, with more and more constant obedience to how God in us has us becoming in our new nature in Jesus, so we are all-loving like Jesus who is growing in us. So, this is not merely a power-play thing of being able to easily push Satan around. But we are in sharing with God, Himself, right "in the presence of my enemies" > Psalm 23:5 < our enemies can be memories of our own past which no longer have power in us to keep us suffering or bragging.
Jesus guarantees >
"'Take My yoke upon you and learn from Me, for I am gentle and lowly in heart, and you will find rest for your souls.'" (Matthew 11:29)
This rest in Christ is almighty, of Jesus God's own Son growing in us as our new inner Person.
So, it is good to notice what it means that God cast Satan and many evil angels out of Heaven. Heaven is not only some nicy nicy place, but safe. And in us Jesus now shares this safety with us here on this earth in this life, even, since Jesus is from Heaven. Saved means safe. Our Apostle Paul was sent by Jesus to the Gentiles in order to turn us Gentiles "from darkness to light, and from the power of Satan to God", we have in Acts 26:18, so we may "receive forgiveness of sins and an inheritance among those who are sanctified by faith in Me," Jesus says.
So, our table with God our Father is not only with our enemies present. We are not isolated, but in sharing with God Himself and one another who are submissive to how God has us becoming and loving. And in this is almighty safety, more and more >
"There is no fear in love; but perfect love casts out fear, because fear involves torment. But he who fears has not been made perfect in love." (1 John 4:18)
God's love in us > Romans 5:5 > is almighty against fear. This is not about how spiritual we can make ourselves be, but this is about how spiritual God is and how He shares this with us, spiritually and emotionally > "you will find rest for your souls." (in Matthew 11:28-30)
So, we answer to You, O God, if we are wise, and we are wise not to try to make you answer to us and our arguing. We thank You and glorify You, in the name of Jesus who is Your Son, amen.