Well....close, it was Eve and the serpent not Adam and the serpent.
I don't believe the Serpent was a female although some "non cannon" books do reference this other creature as Adams first wife "Lilith", created at the same time as Him before Eve was taken from his side.
That is not what I'm referring to here.
It was only after Eve was separated from Adam she was able to be deceived and thereby seduced by a man called the serpent producing Cain.
Adam in his whole original condition representing God could not have been deceived...IMHO of course.
PROVERBS 30:4
Who hath ascended up into heaven, or descended? who hath gathered the wind in his fists? who hath bound the waters in a garment? who hath established all the ends of the earth? what [is] his name, and what [is] his son's name, if thou canst tell?
JOHN 3:13
And no man hath ascended up to heaven, but he that came down from heaven, [even] the Son of man which is in heaven.
The sons of God descending comes from their being attributes of God through the Lord Jesus Christ born first as mortals like you and I, and then being born again by the Spirit and given the power to become sons of God.
JOHN 1:12
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:
ROMANS 8:18
For I reckon that the sufferings of this present time [are] not worthy [to be compared] with the glory which shall be revealed in us.
ROMANS 8:19
For the earnest expectation of the creature waiteth for the manifestation of the sons of God.
The angels that are thrust out of heaven descend having been deceived by Lucifer...
REVELATION 12:4
And his tail drew the third part of the stars of heaven, and did cast them to the earth: and the dragon stood before the woman which was ready to be delivered, for to devour her child as soon as it was born.
REVELATION 12:9
And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him.
They come down subject to become human through the part of Cain's lineage that remains in us today through the carnality of the flesh.
In the soul of man the sons of God are born again through the Spirit of God.
This explains the waring within us of the flesh against the Spirit.
I guess this would fall under...unseen Spiritual Hierarchies 101.
Two different groups and two different ways of coming down.
However you are correct in saying the sons of god did and are descending from heaven.
The battle from there has come to the earth.
Yes, those were angels, spirit creatures.
However they were 1. placed in a state of tartus (spelling) and then the hybrids were destroyed.