Children of God in the Bible: John 1:12-13
When we accept Christ, we become not slaves or servants to God, but His children. Our relationship with God is that of a family, characterized by unconditional love and support.
Offspring in the Bible - a Christian perspective
Those who follow Christ are more than just members of a religion--they're part of God's family. He identifies us as His children, and loves us with the same devotion that a father shows to his children.
Adoption in the Bible: Romans 8:16
When we accept Christ, we become "adopted" children of God, members of His family. The Holy Spirit Himself testifies to our status as God's children.