I wasn't a child of God until I was saved. The sons of God referred to in gen 6 were Godly men, that is why they were called sons of God.
http://www.godandscience.org/doctrine/nephilim.html
A son of God is a person who is created or is born of God.
37 the son of Methuselah, the son of Enoch, the son of Jared, the son of Mahalalel, the son of Cainan, 38 the son of Enos, the son of Seth,
the son of Adam, the son of God. Luke 3:37-38
Adam was created directly by God.
Jesus is
the only begotten Son of God.
Believers are called children of God
because they are born again, for they are born of God.
Whoever believes that Jesus is the Christ is
born of God, and everyone who loves Him who begot also loves him who is
begotten of Him. 1 John 5:1
and again -
6 That which is born of the flesh is flesh, and
that which is born of the Spirit is spirit. John 3:6
and again -
Behold , what manner of love the Father hath bestowed upon us,
that we should be called the sons of God: therefore the world knoweth us not, because it knew him not.
Angels are called sons of God -
Now there was a day when
the sons of God came to present themselves before the Lord, and Satan also came among them.7 And the Lord said to Satan, "From where do you come?" So Satan answered the Lord and said,
"From going to and fro on the earth, and from walking back and forth on it." 8 Then the Lord said to Satan, "Have you considered My servant Job, that there is none like him on the earth, a blameless and upright man, one who fears God and shuns evil?"
Job 1:6-8
again -
Again there was a day
when the sons of God came to present themselves before the Lord, and Satan came also among them
to present himself before the Lord. 2 And the Lord said to Satan, "From where do you come?" So Satan answered the Lord and said,
"From going to and fro on the earth, and from walking back and forth on it." Job 2:1-2
4
"Where were you when I laid the foundations of the earth? Tell Me, if you have understanding. 5 Who determined its measurements? Surely you know! Or who stretched the line upon it? 6 To what were its foundations fastened? Or who laid its cornerstone, 7 When the morning stars sang together,
And all the sons of God shouted for joy? 8 "Or who shut in the sea with doors, When it burst forth and issued from the womb; 9 When I made the clouds its garment, And thick darkness its swaddling band;
Job 38:4-9
again -
35 But those who are counted worthy to attain that age, and the resurrection from the dead, neither marry nor are given in marriage; 36 nor can they die anymore,
for they are equal to the angels and are sons of God, being sons of the resurrection.
Luke 20:35-36
Nowhere in the Old Testament do we find a person called
a son of God except Adam.
Only after Jesus was crucified for our sins, and those who believe in Him are born again,
that is to say born of God, being born of the Spirit.
It is only those who
continue to believe and obtain the resurrection, that are sons of God.
19 For the earnest expectation of
the creation eagerly waits for the revealing of the sons of God. 20 For the creation was subjected to futility, not willingly, but because of Him who subjected it in hope; 21 because the creation itself also will be delivered from the bondage of corruption into the glorious liberty of the children of God. 22 For we know that the whole creation groans and labors with birth pangs together until now. 23 Not only that, but we also who have the firstfruits of the Spirit, even we ourselves groan within ourselves,
eagerly waiting for the adoption, the redemption of our body. Romans 8:19-23
The redemption of our body is a reference to the resurrection, whereby all of creation is waiting for those who will be called sons of God to be revealed.
Until then we have been given the power to become sons of God.
12 But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name: 13 Which were born , not of blood, nor of the will of the flesh, nor of the will of man, but of God. John 1:12-13
Furthermore, the sons of God were not human as they were unaffected by the flood, as they continued to produce Nephilim after the flood wiped out every man from the earth except Noah and his family.
The New Testament writers referred to them as angels.
JLB