Christmas is often framed as a celebration of family. We gather around tables, exchange gifts, and lean into the warmth of traditions that feel familiar and safe. But beneath all the nostalgia, Christmas quietly asks a much deeper question: who is actually in God’s family, and how do you get in?

Most people have quick answers to that question, but they tend to fall apart under even light scrutiny. Some assume everyone is in God’s family simply because we are human. But that definition collapses quickly when we consider history’s most evil figures. Others suggest belief in God is enough, yet Scripture tells us even demons believe in God and tremble. Still others argue that being a good person earns a place, but once we define goodness honestly, we realize none of us qualify.

Christmas cuts through the clichés. It gives us an answer that is both sobering and hopeful.

Jesus came to bring us into God’s family. That is not sentimental language. It is the heart of the gospel. And Romans 8 helps us understand both who is in God’s family and how anyone gets there.

The Children of God Are Led by the Spirit of God

Paul is remarkably direct in Romans 8. He does not bury the lead.

“For all who are led by the Spirit of God are sons of God.” (Romans 8:14)

That sentence tells us exactly who belongs in God’s family. Not everyone by birth. Not people who believe vaguely in God. Not those who claim moral effort. The children of God are those led by the Spirit of God.

Paul contrasts two ways of living. One is life according to the flesh, where sin is tolerated, excused, and eventually embraced. The other is life led by the Spirit, where sin is resisted and fought, even when the fight is exhausting and imperfect. Living according to the flesh means making peace with sin. Living by the Spirit means going to war with it. One path leads to life, and the other leads to death. Sin never remains harmless when we keep it close. What begins as something we manage eventually becomes something that masters us. Sin promises companionship, but instead, it always delivers destruction.

God did not create us merely to exist. We did not define our own purpose, because we did not create ourselves. Our purpose is assigned by our Creator, and it is not simply survival. We were made to glorify God by living under the loving leadership of his Spirit. So, the first question Romans 8 answers is not how to get into God’s family, but who is already in it. Those led by the Spirit of God are the children of God. That clarity naturally leads to the next question: how does someone become led by the Spirit?

The Only Way to Come into God’s Family Is Through Spiritual Adoption

If Spirit-led obedience marks God’s children, how does someone become one? Paul answers that without ambiguity:

“You have received the Spirit of adoption as sons, by whom we cry, ‘Abba! Father!’” (Romans 8:15)

We do not enter God’s family by good works, religious heritage, or generic belief. We come in by adoption.

Adoption is the act of bringing someone who was not family fully into the family. Not temporarily. Not conditionally. Adoption creates permanent belonging. Scripture describes our natural spiritual state as outsiders. We are strangers to God, enemies in our sin, and spiritual orphans with no claim on his promises. Left to ourselves, we have no inheritance with him. But through Jesus, God does something extraordinary:  He adopts.

This is why adoption resonates so deeply with Christians. We understand what it means to be brought in when we did not belong. We were not family, and then, by grace, we became family.

Spiritual adoption comes with breathtaking privileges. We call God Father. The Spirit himself assures us that we belong. And we are given an inheritance that includes forgiveness and secures our future. We are given purpose, hope, and glory with Christ.

Adoption always comes at a cost. And Jesus paid it.

Here is the heart of Christmas—the eternal Son of God entered the world so that outsiders could be brought home. Jesus was born in a manger, but he was headed for a cross. He lived the life we failed to live and died the death our sin deserved. In his resurrection, he opened the door for spiritual orphans to become sons and daughters of God.

Application: Joyfully Take Your Place in God’s Family

If adoption is received and not earned, then the invitation of Christmas is both simple and profound. For those who belong to God’s family, Christmas becomes an anchor. Life is hard, suffering is real, and circumstances change. But this truth remains unshaken: if you have the Son, you have everything. Your identity is secure, your inheritance is certain, and your Father is faithful.

For those who are still unsure, the invitation is not self-improvement. God is not asking you to try harder or clean yourself up. He is offering you a new identity, a new family, and a new life. Nothing will change here in a few days simply because the calendar turns to 2026. A new year does not create a new heart. But God does.

Jesus came so that outsiders could be brought in, orphans could become sons and daughters, and sinners could finally come home. Christmas is not just about gathering with family. It is about God building one—and through Jesus, there is a place for you.

Watch the full sermon from Christmas at Mercy Hill here:

Andrew Hopper