In the bible God is given as a title name. Jesus Christ is called God, his Father is called God and the Holy Spirit is called God and they all form part of what is called the Godhead
KJV Acts 17
29 Forasmuch then as we are the offspring of God, we ought not to think that the Godhead is like unto gold, or silver, or stone, graven by art and man's device.Now to many this may seem like a complex concept to grasp but in actuality it is quite simple. There are not Three God's in one God but rather one God with three different individuals who have the same character but have individuality and personality. The are all one in nature and character yet they all have different roles and they all carry the Title name which is God and they all bear witness.
KJV 1 John 5
7 For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.
Nb: The Word being Jesus Christ.Now Dear Friend, one cannot acknowledge one and not the other because they all play vital roles in our Salvation. With The Father lies the Eternal Powered of the Godhead with the Word lies the Eternal Wisdom and the Holy Spirit binds the two by Eternal love.
Some may find it hard to accept or only accept The Father And The Word and not the Spirit or only the Father Or only the Son but always seek clarity from The Creator God for
KJV 1 Corinthians 2
14 But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned.So these things are spiritually discerned and only God's Spirit could make them as clear as crystal to understand.
Now to explain the Office or the Holy Spirit based upon bible definition.
KJV John 16
7 Nevertheless I tell you the truth; It is expedient for you that I go away: for if I go not away, the Comforter will not come unto you; but if I depart, I will send him unto you.
8 And when he is come, he will reprove the world of sin, and of righteousness, and of judgment:
9 Of sin, because they believe not on me;
10 Of righteousness, because I go to my Father, and ye see me no more;
11 Of judgment, because the prince of this world is judged.Scripture plainly states that the three roles or offices of the Holy Spirit is to reprove the world of sin, judgement and righteousness.
To be continued