Hopefully making theology simpler to understand! (2 Corinthians 1:12)

But to all who did receive him, who believed in his name, he gave the right to become children of God,
John 1:12, ESV

We may all be made in God’s image, but we are not all His children.

We become children of God by believing that Jesus is the Christ, the Son of the living God who takes away the sins of the world.