Only the father is God. He is the creator, He is Holy and He is Spirit. He is THE Holy Spirit.
1 Cor 8:6 But to us there is but one God, the Father, of whom are all things, and we in him.....
Jesus Christ is the Son of God, a man fathered by God. He is our redeemer and savior. He is the second Adam, a human being.
1 Cor 8:6 ...and one Lord Jesus Christ, by whom are all things, and we by him.
1 Tim 2:5) For there is one God, and one mediator between God and men, the man Christ Jesus;
holy spirit is what Christians receive from God when they act on Romans 10:9.
Acts 1:
5) For John truly baptized with water; but ye shall be baptized with the Holy Ghost not many days hence.
8) But ye shall receive power, after that the Holy Ghost is come upon you
38) Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.
When the bible says "holy spirit", it is either talking about God (THE Holy Spirit) or God's gift to men (holy spirit). The KJV translators capitalized the words as they saw fit, and are not always right. When the bible uses the words "holy spirit" (or ghost) we have to determine whether it's talking about God (the giver) or holy spirit (the gift). They are not the same thing.
Here holy is not capitalized, but spirit is. It is talking about the gift, both should be lower case.
Eph 1:13 In whom ye also trusted, after that ye heard the word of truth, the gospel of your salvation: in whom also after that ye believed, ye were sealed with that holy Spirit of promise,
God bless.