It's rather difficult to sit down and read any book of the New Testament without it being obvious to the reader in humility and faith through Christ that there are three persons in the Godhead. Paul elaborates on the work of each person in the Godhead rather elaborately throughout Galatians and Ephesians. John records the Revelation of Jesus Christ well establishing it. Each of the Gospels manifests and testifies to the workings of each person in our Lord and Savior Christ Jesus.
Even if one doesn't have the Bible, the call of the Father, the saving work of the Son and the indwelling of the Holy Spirit each provide testimony to their reality to each and every believer through faith in Christ.
I encourage you to study Scripture with the cognizance of God revealing Himself to us in these threee persons, while opportunity still exists. There will come a time when the Holy SPirit is withdrawn and the grace available to us today will not be nearly as available to those who remain behind.
The Holy Spirit is not a person. Many folks "do believe" that the Holy Spirit of God is a separate entity.....and the reason for this doctrinal error is actually quite simple. The Spirit "does things"! [1 Corinthians 12:11][Acts 2:24][1 Peter 3:18][Hebrews 13:20] and [Romans 1:4]. The Spirit participated in creation [Genesis 1:2,26,27], made Job [Job 33:4]....but does this mean it is a person?
If it does, then "Wisdom" is also a person; [Proverbs 8:12,15 and 9:1-3]. Now....nobody actually believes wisdom is a person....but the scriptures plainly show it doing things. ...performing "works"....with human like qualities. The Holy Spirit of God also performs works but teaching that it is a separate person is as silly as believing that wisdom would be a separate person.
This is what the "New Catholic Encyclopedia" says: "The OT (Old Testament) clearly does not envisage God's spirit as a person, neither in the strictly philosophical sense, nor in the Semitic sense. God's spirit is simply God's Power. If it is sometimes represented as being distinct from God, it is because the breath of Yahweh acts exteriorly (Isa. 48:16; 63:11; 32:15).......Very rarely do the OT writers attribute to God's spirit emotions or intellectual activity (Isa. 63:10; Wis.1:3-7). When such expressions are used, THEY ARE MERE FIGURES OF SPEECH that are explained by the fact that the RUAH was regarded also as the seat of intellectual acts and feeling (Gen. 41:8). Neither is there found in the OT or in rabbinical literature the notion that God's spirit is an intermediary being between God and the world. This activity is proper to the angels, although to them is ascribed some of the activity that elsewhere is ascribed to the spirit of God" (New Catholic Encyclopedia, Vol. 13, p. 574, emphasis theirs).
Is the Holy Spirit of God a person? Obviously not. Can you find a scripture that says The Spirit has a body, eyes, mouth, ears??? No! Some scriptures are said to give the Spirit of God human like qualities, [Ephesians 4:30]. Ah! The Spirit can be grieved....so it must be a person. [Acts 7:51] Stiff necked people resisting the Spirit. [Acts 5:9] Tempting the Spirit. These are some reasons the Trinitarians believe the Spirit is a person. But, does giving human like qualities to something make it a person?
How many times have you called a favorite car or boat "Honey bun"? People give personal qualities to inanimate objects all the time. Even God inspired this kind of language when Moses referred to Cain killing Abel! [Genesis 4:10] The LORD said, "What have you done? Listen! Your brother's blood cries out to me from the ground. Another example; [Psalm 98:8] Let the floods clap their hands. Let the hills be joyful together.
Would we say that the "blood, the flood and the hills" are persons? I can show you scriptures indicating that God and His Son have body parts. You can show me no scripture that says the spirit has the same.
The Greek assigns a masculine gender for the word "Spirit" and we see it referred to as HE, HIM, HIMSELF throughout the New Testament. In the Old Testament the gender is female. Most languages have genders for their nouns so this proves nothing. The Greek "Parakletos" (comforter) has a masculine gender. This does not mean that Parakletos is a person.....only a noun.
Again, let me state.....The concept of a Trinitarian God head is Pagan. It existed long before in the "Babylonian Mystery Religion" and was allowed to enter the early Church from a convenience standpoint. It is not scriptural in any way shape or form. The mere fact that the "Johannine Comma" [1 John 5:7-8] exists should cause those of you disposed to this silliness to reconsider your doctrinal positions.