We do not fear death because we have been blesses with every spiritual blessing in the heavenly realms in Christ. Pagans do fear death because because they obey the devil. And the devil through fear of death keeps them in bondage.
We serve God because in His love He chose us as His own in Christ.
3 Blessed be the God and Father of our Lord Jesus Christ, who has crowned us with every spiritual blessing in the heavenly realms in Christ; 4 even as, in His love, He chose us as His own in Christ before the creation of the world, that we might be holy and without blemish in His presence. 5 For He pre-destined us to be adopted by Himself as sons through Jesus Christ—such being His gracious will and pleasure—6 to the praise of the splendor of His grace with which He has enriched us in the beloved One. Ephesians 1
We needed saving.
1 To you Gentiles (Pagans) also, who were dead through your offenses and sins, 2 which were once habitual to you while you walked in the ways of this world and obeyed the Prince of the powers of the air, the spirits that are now at work in the hearts of the sons of disobedience—to you God has given Life. 3 Among them all of us also formerly passed our lives, governed by the inclinations of our lower natures, indulging the cravings of those natures and of our own thoughts, and were in our original state deserving of anger like all others. Ephesians 2
By God’s grace, we have been saved.
8 For it is by grace that you have been saved through faith; and that not of yourselves. It is God’s gift, and is not on the ground of merit—9 so that it may be impossible for any one to boast. Ephesians 2
God delivered us out of darkness and transferred us into the Kingdom of His Son
13 It is God who has delivered us out of the dominion of darkness, and has transferred us into the Kingdom of His dearly-loved Son, 14 in whom we have our redemption—the forgiveness of our sins. Colossians 1
God delivered us by having Jesus taste death for us.
“that through death He might render powerless him who had authority over death, that is, the Devil, and might set at liberty all those who through fear of death had been subject to lifelong slavery.”
9 But Jesus—who was made a little inferior to the angels in order that through God’s grace He might taste death for every human being—we already see wearing a crown of glory and honour because of His having suffered death. 10 For it was fitting that He for whom, and through whom, all things exist, after He had brought many sons to glory, should perfect by suffering the Prince Leader who had saved them. 11 For both He who sanctifies and those whom He is sanctifying have all one Father; and for this reason He is not ashamed to speak of them as His brothers; 12 as when He says: “I will proclaim Thy name to My brothers: in the midst of the congregation I will hymn Thy praises;” 13 and again, “As for Me, I will be one whose trust reposes in God;” and again, “Here am I, and here are the children God has given Me.”
14 Since then the children referred to are all alike sharers in perishable human nature, He Himself also, in the same way, took on Him a share of it, in order that through death He might render powerless him who had authority over death, that is, the Devil, 15 and might set at liberty all those who through fear of death had been subject to lifelong slavery. Hebrews 2
God speaking to Paul sent him “to open their (Pagan) eyes, that they may turn from darkness to light and from the obedience to Satan to God.”
Paul had been persecuting Christians. God stopped him and turned him from legalism to serving God.
12 “While thus engaged, I was traveling one day to Damascus armed with authority and a commission from the High Priests, 13 and on the journey, at noon, Sir, I saw a light from Heaven—brighter than the brightness of the sun—shining around me and around those who were traveling with me. 14 We all fell to the ground; and I heard a voice which said to me in Hebrew, “`Saul, Saul, why are you persecuting Me? You are finding it painful to kick against the ox-goad.’ 15 “`Who art Thou, Lord?’ I asked. “`I am Jesus whom you are persecuting,’ the Lord replied. 16 `But rise, and stand on your feet; for I have appeared to you for the very purpose of appointing you My servant and My witness both as to the things you have already seen and as to those in which I will appear to you. 17 I will save you from the Jewish people and from the Gentiles, to whom I send you to open their eyes, 18 that they may turn from darkness to light and from the obedience to Satan to God, in order to receive forgiveness of sins and an inheritance among those who are sanctified through faith in Me.’ Acts 26
Scripture quoted above is from the Weymouth New Testament WNT
Serving God Scripture quoted below is from the KJV
Lk 4:8 And Jesus answered and said unto him, Get thee behind me, Satan: for it is written, Thou shalt worship the Lord thy God, and him only shalt thou serve.
Lk 16:13 No servant can serve two masters: for either he will hate the one, and love the other; or else he will hold to the one, and despise the other. Ye cannot serve God and mammon.
Act 6:2 Then the twelve called the multitude of the disciples unto them, and said, It is not reason that we should leave the word of God, and serve tables.
Act 7:7 And the nation to whom they shall be in bondage will I judge, said God: and after that shall they come forth, and serve me in this place.
Act 27:23 For there stood by me this night the angel of God, whose I am, and whom I serve,
Ro 1:9 For God is my witness, whom I serve with my spirit in the gospel of his Son, that without ceasing I make mention of you always in my prayers;
Ro 7:25 I thank God through Jesus Christ our Lord. So then with the mind I myself serve the law of God; but with the flesh the law of sin.
1 Th 1:9 For they themselves shew of us what manner of entering in we had unto you, and how ye turned to God from idols to serve the living and true God;
2 Ti 1:3 I thank God, whom I serve from my forefathers with pure conscience, that without ceasing I have remembrance of thee in my prayers night and day;
Heb 9:14 How much more shall the blood of Christ, who through the eternal Spirit offered himself without spot to God, purge your conscience from dead works to serve the living God?
Heb 12:28 Wherefore we receiving a kingdom which cannot be moved, let us have grace, whereby we may serve God acceptably with reverence and godly fear:
Rev 7:15 Therefore are they before the throne of God, and serve him day and night in his temple: and he that sitteth on the throne shall dwell among them.
Rev 22:3 And there shall be no more curse: but the throne of God and of the Lamb shall be in it; and his servants shall serve him: