Luther's doctrine of "predestinatoin" is a novelty to the Christian faith - it is nowise Biblical or traditional. You claim that nobody can snatch our salvation from God's hands, but this is merely a half-truth, for God gave us self will and choice. We can lose our salvation all on our own without somebody "snatching" it from us. Listen to the rest of Scripture, and not just one verse; for Jesus said that: "Man does not live by bread alone but by every word of God".
"For if we sin deliberately after receiving the knowledge of the truth, there no longer remains a sacrifice for sins, but a fearful prospect of judgment, and a fury of fire which will consume the adversaries." (Hebrews 10: 26 - 27)
Luther's doctrine, and your belief in it, strip away the Christian doctrine of Judgement Day. What will there be to judge? The "predestined" will simply be sent to heaven, and the rest to Hell. According to Luther and you, our actions while alive on earth will be as nothing. But true Christian teaching and the Bible mock this nonsense.
(1). "For you have need of endurance, so that you may do the will of God and receive what is promised". (Hebrews 10:36).
(2). "For we must all appear before the judgment seat of Christ, so that each one may receive good or evil, according to what he has done in the body." (2 Corinthians 5:10).
(3). "Behold, I come quickly, and my reward is with me, to render to every man according to his works". (Revelation 22:12).
(4). "With fear and trembling work out your salvation". (Philippians 2:12).
(5). "Serve the LORD with fear, with trembling kiss his feet, lest he be angry, and you perish in the way; (Psalms 2: 11- 12).
(6). "For the Son of man is to come with his angels in the glory of his Father, and then he will repay every man for what he has done. (Mathew 16:27)
(7). "But be doers of the word, and not hearers only, deceiving yourselves." (James 1:22)
(8). " but I chastise my body and subdue it, lest after preaching to others I myself should be become a castaway". (I Corinthians 9:27)