Arguing about a bastardised version of the divine name is nonsense. Christians viewed themselves as children of god and called him Abba, Father.
That is the whole point of the gospel.
He came to that which was his own, but his own did not receive him. Yet to all who did receive him, to those who believed in his name, he gave the right to become children of God, children born not of natural descent, nor of human decision or a husband’s will, but born of God - John 1
The Spirit you received does not make you slaves, so that you live in fear again; rather, the Spirit you received brought about your adoption to sonship. And by him we cry, “Abba, Father.” - Roman 8
Because you are his sons, God sent the Spirit of his Son into our hearts, the Spirit who calls out, “Abba, Father.” - Galatians 4
But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed - Galatians 1