Scripture backs up my assertion. "For all who are led by the Spirit of God are sons of God. For you did not receive the spirit of slavery to fall back into fear, but you have received the Spirit of adoption as sons, by whom we cry, “Abba! Father!” The Spirit himself bears witness with our spirit that we are children of God, and if children, then heirs—heirs of God and fellow heirs with Christ, provided we suffer with him in order that we may also be glorified with him." Romans 8:14-17
"And not only the creation, but we ourselves, who have the firstfruits of the Spirit, groan inwardly as we wait eagerly for adoption as sons, the redemption of our bodies." Romans 8:17
"The true light, which gives light to everyone, was coming into the world. He was in the world, and the world was made through him, yet the world did not know him. He came to his own, and his own people did not receive him. But to all who did receive him, who believed in his name, he gave the right to become children of God, who were born, not of blood nor of the will of the flesh nor of the will of man, but of God." John 1:9-13
"I mean that the heir, as long as he is a child, is no different from a slave, though he is the owner of everything, but he is under guardians and managers until the date set by his father. In the same way we also, when we were children, were enslaved to the elementary principles of the world. But when the fullness of time had come, God sent forth his Son, born of woman, born under the law, to redeem those who were under the law, so that we might receive adoption as sons. And because you are sons, God has sent the Spirit of his Son into our hearts, crying, “Abba! Father!” So you are no longer a slave, but a son, and if a son, then an heir through God." Galatians 3:4
"Blessed be the God and Father of our Lord Jesus Christ, who has blessed us in Christ with every spiritual blessing in the heavenly places, even as he chose us in him before the foundation of the world, that we should be holy and blameless before him. In love he predestined us for adoption to himself as sons through Jesus Christ, according to the purpose of his will, to the praise of his glorious grace, with which he has blessed us in the Beloved. In him we have redemption through his blood, the forgiveness of our trespasses, according to the riches of his grace, which he lavished upon us, in all wisdom and insight making known to us the mystery of his will, according to his purpose, which he set forth in Christ as a plan for the fullness of time, to unite all things in him, things in heaven and things on earth. In him we have obtained an inheritance, having been predestined according to the purpose of him who works all things according to the counsel of his will, so that we who were the first to hope in Christ might be to the praise of his glory. In him you also, when you heard the word of truth, the gospel of your salvation, and believed in him, were sealed with the promised Holy Spirit, who is the guarantee of our inheritance until we acquire possession of it, to the praise of his glory." Ephesians 1:3-14
"And he came and preached peace to you who were far off and peace to those who were near. For through him we both have access in one Spirit to the Father. So then you are no longer strangers and aliens, but you are fellow citizens with the saints and members of the household of God, built on the foundation of the apostles and prophets, Christ Jesus himself being the cornerstone, in whom the whole structure, being joined together, grows into a holy temple in the Lord. In him you also are being built together into a dwelling place for God by the Spirit." Ephesians 2:17-22
By our adoption into God's family we truly become brothers and sisters in (and of) Christ Jesus with the Lord in Heaven being our Father. The relationship becomes personal. When Christ Jesus died on the Cross and gave up his Spirit, he tore away the separation between God and Man --- "Now from the sixth hour there was darkness over all the land until the ninth hour. And about the ninth hour Jesus cried out with a loud voice, saying, “Eli, Eli, lema sabachthani?” that is, “My God, my God, why have you forsaken me?” And some of the bystanders, hearing it, said, “This man is calling Elijah.” And one of them at once ran and took a sponge, filled it with sour wine, and put it on a reed and gave it to him to drink. But the others said, “Wait, let us see whether Elijah will come to save him.” And Jesus cried out again with a loud voice and yielded up his spirit.
And behold, the curtain of the temple was torn in two, from top to bottom. And the earth shook, and the rocks were split." Matthew 27:45-51
So, what is the significance of the curtain of the temple being torn? The Curtain was used to shield from the people the Ark of the Covenant wherein the LORD's presence resided. "The LORD spoke to Moses, saying, “On the first day of the first month you shall erect the tabernacle of the tent of meeting. And you shall put in it the ark of the testimony, and you shall screen the ark with the curtain. And you shall bring in the table and arrange it, and you shall bring in the lampstand and set up its lamps" Exodus 40:1-4
Before Christ, the Jews prayed to a distant LORD, direct access to whom was forbidden under the law, and who could only be visited within the temple by the Holy of Holies. When our Lord Jesus was crucified, he tore the separation (curtain) forever which existed between God and man, thereby giving us direct access to God through Him, so we who believed would have sonship and adoption into his family, direct access to him via prayer, and henceforth call him Abba, Father.