Why is the concept of the universal brotherhood of man misunderstood?

Many people believe in the universal brotherhood of man, but the Bible clarifies that there are ultimately two families: the brotherhood of Satan and the brotherhood of Christ. John 8:44 underscores that those who are not in Christ are children of the devil, emphasizing that we do not all share the same spiritual fatherhood. This understanding highlights the necessity of regeneration and adoption into God's family through faith in Christ, as articulated in Ephesians 2:1-5, which contrasts our former nature with our new life in Christ.