I am so glad you believe Jesus is God. So many today deny that truth. Yet, some wrongfully think Jesus is the Father in the fact that the Father just puts on a mask as the Son (Jesus). So it is not really Jesus but the Father. Others believe the Son (Jesus) is also the Father and the Son merely put on a mask so as to be the Father. Jesus is still God to them, but Christ is not exactly as described as we see Him in Scripture. If what they say is true (in the fact that the Trinity is false): This means Jesus was putting on a show (kind of like an actor) and was pretending to talk with another persona of Himself when in reality He was only talking with Himself and He was not really making any kind of requests to the Father but only to Himself. So when Jesus says to take this cup away from to the Father (if it be possible), it really does not mean that (for those who deny the Trinity).
As for your statement that the Holy Ghost is the breath of God. While Jesus did breath the Holy Ghost upon His disciples, this does not mean, that the Holy Ghost is not a unique person. The Holy Ghost is a distinct persona or person within the Trinity or Godhead.
The Holy Spirit is called God:
“Peter said, Ananias, why hath Satan filled thine heart to lie to the Holy Ghost, and to keep back part of the price of the land? Whiles it remained, was it not thine own? and after it was sold, was it not in thine own power? why hast thou conceived this thing in thine heart? thou hast not lied unto men, but unto God.” (Acts of the Apostles 5:3-4).
The Holy Spirit is on equal level with being God:
“Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost:” (Matthew 28:19).
The Holy Spirit is eternal:
“How much more shall the blood of Christ, who through the eternal Spirit offered himself without spot to God, purge your conscience from dead works to serve the living God?” (Hebrews 9:14).
The Holy Spirit is a person:
“And I will pray the Father, and he shall give you another Comforter, that he may abide with you forever;” (John 14:16).
The Holy Spirit can be grieved:
“And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption.” (Ephesians 4:30).
The Holy Spirit can be blasphemed:
“And whosoever speaketh a word against the Son of man, it shall be forgiven him: but whosoever speaketh against the Holy Ghost, it shall not be forgiven him, neither in this world, neither in the world to come.” (Matthew 12:32).
Important Note: Only God can be blasphemed.
The Father Sent The Holy Spirit
The Bible says that God the Father sent the Holy Spirit:
The Father will send the Holy Spirit, not Himself, to help believers:
Jesus said,
But the Helper, the Holy Spirit, whom the Father will send in my name, he will teach you all things, and bring to your remembrance all that I said to you (
John 14:26).
There Is A Difference Between The Father And The Holy Spirit:
The Holy Spirit does the will of God the Father.
Paul wrote,
And He who searches our hearts knows the mind of the Spirit, because the Spirit intercedes for the saints in accordance with God's will (
Romans 8:27).
Source used for Holy Spirit being distinct from the Father:
https://www.blueletterbible.org/faq/don_stewart/don_stewart_325.cfm