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I think what is at play here is a matter or your perception. Or to put another way, "things don't always appear as they seem."
Yes, God is three persons and yet there are so many scriptures that only use Lord, God and many other titles referring to God.
Where no distinction is made, it is obviously unnecessary to make a distinction. The persons of the Trinity are persons in RELATION to each other, any one of the persons in relation to us is simply God, in that there is only one God.
So, the Holy Spirit is a person in relation to the Father and the Son. The Holy Spirit is God in relation to us. If you are in a relationship with the Father/Son/Holy Spirit, then you must be in a relationship with them all; for there is only one God. If you deny one, you deny them all.
Jesus said at John 5:23, "in order that all may honor the Son, even as they honor the Father. He who does not honor the Son does not honor the Father who sent Him. (Notice Jesus was sent, not created).
What about the Holy Spirit? Is He treated unfairly? I think not. Matthew 12:31, "Therefore I say to you, any sin and blasphemy shall be forgiven men, but blasphemy against the Spirit shall not be forgiven."
There is a contrast in this passage between all other sins (even sins against the Son of Man, verse 32) and the sin against the Holy Spirit. The sin against the Holy Spirit is not merely a particular act; rather, to blaspheme the Spirit reflects an attitude that is decidedly against God and His nature. Just read verses 34-35. The Pharisees had this attitude by virtue of them accusing Jesus of joining forces with the devil.
In short, the reason the sin against the Holy Spirit will not be forgiven is because the Pharisees persisted in saying, "He has an unclean spirit." The Pharisees who called the Holy Spirit in Jesus an unclean spirit were rejecting the Spirit's witness to Jesus as Messiah and Savior.