You need to realize that God is Father, Son, and Holy Spirit. By that, I do not mean that Jesus is the Father, and I do not mean the Father is the Spirit, or any other variation of the such. Literally, God is three distinct Persons. If you turn to Isaiah 48, beginning at v. 9:
For the sake of My name I delay My wrath,
And for My praise I restrain it for you,
In order not to cut you off.
Behold, I have refined you, but not as silver;
I have tested you in the furnace of affliction.
For My own sake, for My own sake, I will act;
For how can My name be profaned?
And My glory I will not give to another.
Listen to Me, O Jacob, even Israel whom I called;
I am He, I am the first, I am also the last.
Surely My hand founded the earth,
And My right hand spread out the heavens;
When I call to them, they stand together.
[FONT="]Assemble, all of you, and listen![/FONT]
[FONT="]Who among them has declared these things?[/FONT]
[FONT="]The LORD loves him; he will carry out His good pleasure on Babylon,[/FONT]
[FONT="]And His arm will be against the Chaldeans. [/FONT]
I, even I, have spoken; indeed I have called him,
I have brought him, and He will make his ways successful.
Come near to Me, listen to this:
From the first I have not spoken in secret,
From the time it took place, I was there
And now the Lord GOD has sent Me, and His Spirit.
In Isaiah 48, we have 'the first and the last,' the Creator ('Surely My hand founded the earth, And My right hand spread out the heavens') speaking, yet, He says in v. 16, that He and the Spirit were sent by God. So we have God sending God, and God. We have three Persons here. We have the 'Lord GOD' that has sent 'Me,' and 'His Spirit.' But yet this very same 'Me' is the Creator, the first and the last. Here in Isaiah 48 we have the pre-incarnate Christ speaking. We have the Father, sending the Word (Christ), and the Spirit.
Likewise, turn to Genesis 1:26, which says, "Then God said, 'Let Us make man in Our image, according to Our likeness; and let them rule over the fish of the sea and over the birds of the sky and over the cattle and over all the earth, and over every creeping thing that creeps on the earth.'" Who is the 'Us'? Who is the 'Our'? God -- Father, Son, and Holy Spirit. John 17:5, Jesus says, 'Now, Father, glorify Me together with Yourself, with the glory which I had with You before the world was.'
It is clear, that there are three distinct Persons, and they're all called God. For the sake of time, I won't list every verse that proclaims each, Father, Son, and Holy Spirit as God, otherwise, I'd be here for hours. 1 Peter 1:2, 2 Peter 1:17 proclaims that the Father is God. John 1:1-14, Hebrews 1:8-12 proclaim that Jesus is God. And Acts 5:1-4, Hebrews 3:7-11 proclaims that the Holy Spirit is God. Though, they're three distinct Person, Deuteronomy 6:4 proclaims that God is One. Not three separate Gods, but One God. How can that be? How can three Persons be One God?
I think the best illustration that helps paint the 'Trinity,' is found in Galatians 3:28. It'll help give you that mental image of what I mean by 'three distinct Persons, but One God.' Galatians 3:28 says, 'There is neither Jew nor Greek, there is neither slave nor free man, there is neither male nor female; for you are all one in Christ Jesus.' Likewise, the Father, Son, and Holy Spirit are One in the Godhead, One God. Another way of looking at it is pictured in Mark 10:6-8, which states, ‘But from the beginning of creation, God MADE THEM MALE AND FEMALE. FOR THIS REASON A MAN SHALL LEAVE HIS FATHER AND MOTHER, AND THE TWO SHALL BECOME ONE FLESH; so they are no longer two, but one flesh.’ The Greek term 'echad,' which is the term used in Deuteronomy 6:4 for 'one,' means, 'compound unity,' and is the same term used in Galatians 3:28, when it says, 'here is neither Jew nor Greek, there is neither slave nor free man, there is neither male nor female; for you are all one in Christ Jesus,' as well as in Mark 10:6-8, 'But from the beginning of creation, God MADE THEM MALE AND FEMALE. FOR THIS REASON A MAN SHALL LEAVE HIS FATHER AND MOTHER, AND THE TWO SHALL BECOME ONE FLESH; so they are no longer two, but one flesh.’
What's even more interesting is that Scripture declares that not only the Father raised Jesus from the dead, but the Spirit also raised Christ from the dead, and even goes to say that Christ raised His own self up from the dead. Father, Son, and Holy Spirit work in unity, together, and not separately:
Galatians 1:1, “Paul, an apostle (not sent from men nor through the agency of man, but through Jesus Christ and God the Father, who raised Him from the dead),”
John 2:19-21, “Jesus answered them, ‘Destroy this temple, and in three days I will raise it up.’ The Jews then said, ‘It took forty-six years to build this temple, and will You raise it up in three days?’ But He was speaking of the temple of His body.”
Romans 8:11, “But if the Spirit of Him who raised Jesus from the dead dwells in you, He who raised Christ Jesus from the dead will also give life to your mortal bodies through His Spirit who dwells in you.”
With that said, I'll conclude with John 17:11, which states, "I am no longer in the world; and yet they themselves are in the world, and I come to You Holy Father, keep them in Your name, the name which You have given Me, that they may be one even as We are."