Many think that all human beings are children of God, since we were all created by Him and that He loves us as children.
If it is true that we were created by God and that He loves his creation, but the Bible teaches that not all are children of God.
The apostle Paul tells us in the book of Romans 8.14 one of the fundamental characteristics of the true children of God: "For all who are led by the Spirit of God, these are children of God." Those who have a life guided by His Spirit, are children of God. Jesus said that the Holy Spirit would teach us all things concerning Him in His Word, (Jn 14.26). Therefore, a person who does not obey his word, spirituality, faith and morals can not give a sign that he is a true son of God. The Holy Spirit places in us the desire to obey his Word and that Word cleanses us. Jesus said: "Now you are clean through the word that I have given you" (Jn 15.3).
The apostle John, in his Gospel, tells us clearly how we can become children of God: "But to all who received him, to those who believe in his name, he gave them the right to become children of God" (John 1:12).
"Believe in Him and receive Him." This implies a renunciation of a life of sin and a sincere, humble and genuine approach, without conditions, to live a life according to his Word. It is not a religion, it is not about what one believes, it is not about good works, it is about what God says. There is no other way, it is Him.
"That if you confess with your mouth that Jesus is the Lord, and believe in your heart that God raised him from the dead, you will be saved" (Romans 10.9).