okay so i think in a sense all three of them share the same spirit so they are the same person, they just all serve a different purpose
“God” is the Heavenly Father “Jesus” is the Son of God and Savior of the world, and The Holy Spirit or The Holy Ghost the spirit of God, he helps us avoid temptations and helps us stay clean from sin, he also comforts us
Idk why it’s done that way but that’s how Jesus says it, he says “Father” or “Abba” they mean the same thing