Ephesians 2:10 For we are His workmanship, created in Christ Jesus for good works, which God prepared beforehand so that we would walk in them.
God requires something from us; He requires that we serve Him. This does not take away from the free offer of the Gospel. The Gospel message is freely offered and freely received. We in no way earn forgiveness of sins. Romans 6:23 is clear on this:
Romans 6:23 For the wages of sin is death, but the free gift of God is eternal life in Christ Jesus our Lord.
While salvation is freely offered and freely received, those who do receive it are not free to to live for themselves. Christians are bond-slaves of the Lord Jesus Christ. It is their obligation to serve Him.
Colossians 3:23-24 Whatever you do, do your work heartily, as for the Lord rather than for men, knowing that from the Lord you will receive the reward of the inheritance. It is the Lord Christ whom you serve.
Romans 12:1 Therefore I urge you, brethren, by the mercies of God, to present your bodies a living and holy sacrifice, acceptable to God, which is your spiritual service of worship.
Christians do not have the freedom to live for themselves. This is not to be confused with our failures in serving Christ fully. Because we still battle with indwelling sin will often fall short in our Christian duties. We are forgiven even for these failures; but the requirement is not changed. Christians were created for good works. Ephesians 2:10 could not be any clearer. A professed Christian who has no desire for good works needs to heed Paul's warning:
2 Corinthians 13:5 Test yourselves to see if you are in the faith; examine yourselves! Or do you not recognize this about yourselves, that Jesus Christ is in you-- unless indeed you fail the test?
Let us heed the admonition from the author of Hebrews:
Hebrews 10:23-24 Let us hold fast the confession of our hope without wavering, for He who promised is faithful; 24 and let us consider how to stimulate one another to love and good deeds,