Q.25: How did Christ, being the Son of God become man?
A. Christ the Son of God became man by taking to Himself a true body, and a reasonable soul, being conceived by the power of the Holy Spirit in the womb of the Virgin Mary, and born of her, yet without sin.
To a virgin betrothed to a man whose name was Joseph, of the house of David. The virgin’s name was Mary. Luke 1:27
And behold, you will conceive in your womb and bring forth a Son, and shall call His name JESUS. Luke 1:31
Then Mary said to the angel, “How can this be, since I do not know a man?” And the angel answered and said to her, “The Holy Spirit will come upon you, and the power of the Highest will overshadow you; therefore, also, that Holy One who is to be born will be called the Son of God. Luke 1:34-35
Then she spoke out with a loud voice and said, “Blessed are you among women, and blessed is the fruit of your womb! Luke 1:42