That is not right. The Holy Spirit did not become flash. It was the Word who became flesh, the Word is the Son of God. The Word is God the Son. John 1:14 And the Word was made flesh and dwelt among us; and we have seen his glory, the glory of the only Son of the Father: fullness of truth and loving-kindness.
15 John bore witness to him openly, saying, “This is the one who comes after me, but he is already ahead of me, for he was before me.” 16 From his fullness we have all received, favour upon favour. 17 For God had given us the law through Moses, but Truth and Loving-kindness came through Jesus Christ. 18 No one has ever seen God, but God-the-only-Son made him known: the one, who is in and with the Father.
The Holy Spirit overshadowed the virgin Mary and Mary gave birth to the Son of God. Luke 1:26 In the sixth month, the angel Gabriel was sent from God, to a town of Galilee called Nazareth. He was sent 27 to a virgin, who was betrothed to a man named Joseph, of the family of David; and the virgin’s name was Mary. 28 The angel came to her and said, “Rejoice, full of grace, the Lord is with you!” 29 Mary was troubled at these words, wondering what this greeting could mean. 30 But the angel said, “Do not fear, Mary, for God has looked kindly on you. 31 You shall conceive and bear a son; and you shall call him Jesus. 32 He will be great, and shall rightly be called Son of the Most High. The Lord God will give him the kingdom of David, his ancestor; he will rule over the people of Jacob forever; 33 and his reign shall have no end.” 34 Then Mary said to the angel, “How can this be, since I am a virgin?” 35 And the angel said to her, “The Holy Spirit will come upon you and the power of the Most High will overshadow you; therefore, the holy child to be born of you shall be called Son of God. 36 Even your relative, Elizabeth, is expecting a son in her old age, although she was unable to have a child; and she is now in her sixth month. 37 With God nothing is impossible.” 38 Then Mary said, “I am the handmaid of the Lord, let it be done to me as you have said.” And the angel left her.