Certainly, the Bible teaches that salvation is an unconditional gift from God, as part of the New Covenant. To some, that means Christians are under no obligations. They honor God in their actions instinctively, goes the reasoning, not because God orders them to do so. Let's examine that opinion in light of the Bible.
The primary scriptural reference to the New Covenant in the New Testament is Hebrews 8:6-13 Hebrews 8:6-13  But now has he obtained a more excellent ministry, by how much also he is the mediator of a better covenant, which was established on better promises.
 For if that first covenant had been faultless, then should no place have been sought for the second.
 For finding fault with them, he said, Behold, the days come, said the Lord, when I will make a new covenant with the house of Israel and with the house of Judah:
 Not according to the covenant that I made with their fathers in the day when I took them by the hand to lead them out of the land of Egypt; because they continued not in my covenant, and I regarded them not, said the Lord.
 For this is the covenant that I will make with the house of Israel after those days, said the Lord; I will put my laws into their mind, and write them in their hearts: and I will be to them a God, and they shall be to me a people:
 And they shall not teach every man his neighbor, and every man his brother, saying, Know the Lord: for all shall know me, from the least to the greatest.
 For I will be merciful to their unrighteousness, and their sins and their iniquities will I remember no more.
 In that he said, A new covenant, he has made the first old. Now that which decays and waxes old is ready to vanish away.
American King James Version×. All covenants of God contain two primary elements: (1) promises from God and (2) obligations and responses from people. Hebrews 8:6 Hebrews 8:6But now has he obtained a more excellent ministry, by how much also he is the mediator of a better covenant, which was established on better promises.
American King James Version×reminds us that promises are the underpinning of covenants.
There was fault with "the first" covenant (Hebrews 8:7 Hebrews 8:7For if that first covenant had been faultless, then should no place have been sought for the second.
American King James Version×). This is a reference to the first covenant God made with Israel and Judah, not to the first covenant ever made by God with a man. It's this first covenant God made with Israel that people today commonly call "the Old Covenant." How could there be any fault with a covenant of God? Fault could only be on the human side. Indeed, Hebrews 8:8 Hebrews 8:8For finding fault with them, he said, Behold, the days come, said the Lord, when I will make a new covenant with the house of Israel and with the house of Judah:
American King James Version×confirms that fact; the people did not fulfill their obligations or respond as they should have.
"They did not continue in My covenant..., says the Lord" (Hebrews 8:9 Hebrews 8:9Not according to the covenant that I made with their fathers in the day when I took them by the hand to lead them out of the land of Egypt; because they continued not in my covenant, and I regarded them not, said the Lord.
American King James Version×), so God established a new covenant, so much improved, according to Hebrews 8:13 Hebrews 8:13In that he said, A new covenant, he has made the first old. Now that which decays and waxes old is ready to vanish away.
American King James Version×, that it causes the former covenant to pale in comparison. The language does not imply a sudden or violent change, but rather a renewal. Possessing only a sketchy understanding of the broad picture, many people today assume that, in establishing the New Covenant, God removed virtually all obligations from it. They mistakenly believe that "grace" means a covenant that is "all promise." No one who understands covenants would make that assumption.
Indeed, it would no longer be a covenant if it contained only promises from God but was devoid of obligations and expected responses from people! Trying to sweep away every aspect of the earlier covenant also overlooks the fact that God's grace was the basis of the Old Covenant as well. We should view His rescue of Israel from Egypt as nothing less than undeserved physical salvation. The people of Israel did not earn their way out of slavery by their obedience to God. He graciously freed them, and keeping His law was an appropriate, expected response on their part.
When a person understands that God has decreed a covenant, he or she should ask, "What is expected of me?" As Paul expressed in Romans 6:18 Romans 6:18Being then made free from sin, you became the servants of righteousness.
American King James Version×, Christians are to be "slaves of righteousness." Could God state our obligation of obedience any plainer?
However, it would be too narrow an interpretation to say that the only obligation or appropriate response to the New Covenant is obedience. God desires and expects more than mere compliance. He wants our hearts to be in the covenant and the covenant to be in our hearts. The "better promises" of the New Covenant include an enhanced capacity, through the Spirit of God, not only to obey Him, but also to love Him as a Father.
The appropriate responses of a Christian toward God are similar to those of a child toward a parent. Paul draws together three scattered Old Testament scriptures in 2 Corinthians 6:16-18 2 Corinthians 6:16-18  And what agreement has the temple of God with idols? for you are the temple of the living God; as God has said, I will dwell in them, and walk in them; and I will be their God, and they shall be my people.
 Why come out from among them, and be you separate, said the Lord, and touch not the unclean thing; and I will receive you.
 And will be a Father to you, and you shall be my sons and daughters, said the Lord Almighty.
American King James Version×to make that point. Notice that the fundamental elements of a covenant—promises on the one hand and obligations and responses on the other—are present here. The promises include: "I will dwell in them." "And walk among them." "I will be their God." "And they shall be My people." "I will receive you." "I will be a Father to you." "And you shall be My sons and daughters."
And the expected obligations and responses include: "And they shall be My people." "Come out from among them." "And be separate." "Do not touch what is unclean." "And you shall be My sons and daughters." (Sons and daughters must obey and be subject to their fathers.)
Through the Holy Spirit, the Father leads those He calls to the truth and convicts them of their responsibility to obey Him. By placing His Spirit in them at baptism, He empowers them to meet His expectations. Thus, the Holy Spirit gives the Christian a new heart and mind, the lack of which resulted in the failure of the people of Israel to keep their obligations in the first covenant that God made with them (Deuteronomy 5:29 Deuteronomy 5:29O that there were such an heart in them, that they would fear me, and keep all my commandments always, that it might be well with them, and with their children for ever!
American King James Version×).
Paul's plain confession of his personal struggle against his nature tells us that Christians do not instinctively honor God in their actions (Romans 7:18-21 Romans 7:18-21  For I know that in me (that is, in my flesh,) dwells no good thing: for to will is present with me; but how to perform that which is good I find not.
 For the good that I would I do not: but the evil which I would not, that I do.
 Now if I do that I would not, it is no more I that do it, but sin that dwells in me.
 I find then a law, that, when I would do good, evil is present with me.
American King James Version×). Conversion doesn't remove human nature, the negative pull within each of us to make wrong choices and do wrong deeds. Nor does conversion remove us from Satan's world or his continuing attempts to sabotage us through temptation.
What does conversion do? God's Spirit in us—that new heart—makes it possible for us to resist temptation and to live God's way of life (Romans 7:22-25 Romans 7:22-25  For I delight in the law of God after the inward man:
 But I see another law in my members, warring against the law of my mind, and bringing me into captivity to the law of sin which is in my members.
 O wretched man that I am! who shall deliver me from the body of this death?
 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.
American King James Version×). The choice and the control are up to the individual.
So, yes, God's gift is unconditional. But there is much more to the picture, as we briefly presented here. We invite you to read our booklets The Road to Eternal Life and Transforming Your Life: The Process of Conversion to learn more about the process of conversion. They explain God's calling, repentance, baptism, the gift of the Holy Spirit, as well as how a Christian can and should continue in the way of faith.