Acts 9: 15But the Lord said to him: “Go! because this man is a chosen vessel to me to bear my name to the nations as well as to kings and the sons of Israel.
There’s no trick. They baptized in the name, singular, of Jesus Christ, by doing so, they did indeed baptize in the name of the Father (John 14:9 Jesus saith unto him, Have I been so long time with you, and yet hast thou not known me, Philip? he that hath seen me hath seen the Father; and how sayest thou then, Show us the Father?) the Son, (Matt 1:21 And she shall bring forth a son, and thou shalt call his name JESUS: for he shall save his people from their sins) and the Holy Spirit (John 14:18 I will not leave you comfortless: I will come to you. 26:But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you.)
Col 2:9 For in him dwelleth all the fulness of the Godhead bodily. Which literally translated means "Within Jesus Christ is everything that is God, and outside of Jesus there is no God. So, if everything that is God is in Jesus, there cannot be any portion of God or a God anywhere else. He is quite simply God all by Himself, manifest of Himself and by Himself in the flesh. So, understanding this Matthew 1:23 becomes quite literal and apparent : Behold, a virgin shall be with child, and shall bring forth a son, and they shall call his name Emmanuel, which being interpreted is, God with us.
Scripture proves out that they baptized in the name/singular of Jesus Christ just as Peter preached on the day of Pentecost in Acts 2:38, why did the Catholic church move away from this?