Who is God?

In the beginning God... (Genesis 1:1); God is Spirit,... (John 4:24); Before the mountains were brought forth, Or ever You had formed the earth and the world, Even from everlasting to everlasting, You are God. (Psalm 90:2); “I AM WHO I AM.” (Exodus 3:14); Jesus said to them, “Most assuredly, I say to you, before Abraham was, I AM.” (John 8:58)

"From nothing, nothing comes."  Since we can see "something" then we understand that "from something, something comes." Science calls this the Law of Biogenesis, not the "theory", so this is an absoute fact!

God is, always has been, always will be, and all wisdom comes from Him:
“The Lord possessed me [wisdom] at the beginning of His way, Before His works of old. I have been established from everlasting, From the beginning, before there was ever an earth. When there were no depths I was brought forth, When there were no fountains abounding with water. Before the mountains were settled, Before the hills, I was brought forth; While as yet He had not made the earth or the fields, Or the primal dust of the world. (Proverbs 8:22-26)

God is independent of creation, but all things are created by Him:
In the beginning God created... (Genesis 1:1); When He prepared the heavens, I [wisdom] was there, When He drew a circle on the face of the deep, When He established the clouds above, When He strengthened the fountains of the deep, When He assigned to the sea its limit, So that the waters would not transgress His command, When He marked out the foundations of the earth, Then I was beside Him as a master craftsman [Christ, Lord God]; And I was daily His delight, Rejoicing always before Him, Rejoicing in His inhabited world, And my delight was with the sons of men. (Proverbs 8:27-31; Genesis 1:1-2, 26, 2:1-3); “Blessed be Your glorious name, Which is exalted above all blessing and praise! You alone are the Lord; You have made heaven, The heaven of heavens, with all their host, The earth and everything on it, The seas and all that is in them, And You preserve them all. The host of heaven worships You. (Nehemiah 9:5-6; Job 38-40:5; Psalm 104)

Christ Jesus, the Son of God, Lord God has always been, from the beginning: But of Him [God] you are in Christ Jesus, who became for us wisdom from God—and righteousness and sanctification and redemption— that, as it is written, “He who glories, let him glory in the Lord.” (I Corinthians 1:30-31, 1:18-25); He [Christ] is the image of the invisible God, the firstborn over all creation. For by Him all things were created that are in heaven and that are on earth, visible and invisible, whether thrones or dominions or principalities or powers. All things were created through Him and for Him. And He is before all things, and in Him all things consist. And He is the head of the body, the church, who is the beginning, the firstborn from the dead, that in all things He may have the preeminence. (Colossians 1:15-18, Genesis 2:4-25, 3:8-11; Revelations 3:14); “I am the Alpha and the Omega, the Beginning and the End,” says the Lord, “who is and who was and who is to come, the Almighty.” (Revelations 1:8)

What did God do before creation? Existed (ie. In the beginning God...)! So why did He create?  Because He wanted to (ie. ...it pleased Him)!:
The Lord has established His throne in heaven, And His kingdom rules over all. Bless the Lord, you His angels, Who excel in strength, who do His word, Heeding the voice of His word. Bless the Lord, all you His hosts, You ministers of His, who do His pleasure. Bless the Lord, all His works, In all places of His dominion. Bless the Lord, O my soul! (Psalm 103:19-22); He [God] has put eternity in their hearts, except that no one can find out the work that God does from beginning to end. I know that whatever God does, It shall be forever. Nothing can be added to it, And nothing taken from it. God does it, that men should fear before Him. As for that which is far off and exceedingly deep, Who can find it out? (Ecclesiasted 3:11, 14, 7:24); Oh, the depth of the riches both of the wisdom and knowledge of God! How unsearchable are His judgments and His ways past finding out! “For who has known the mind of the Lord? Or who has become His counselor?” “Or who has first given to Him And it shall be repaid to him?” For of Him and through Him and to Him are all things, to whom be glory forever. Amen. (Romans 11:33-36; Isaiah 40:12-14; Jeremiah 23:18-20)

We'll never fully understand or grasp the complete knowledge and wisdom of God while we're in the flesh (I Corinthians 13:12).  But we should take great comfort and assurance in knowing that God loves us and cares for us (John 3:12-17), that above all that He created, we are the only thing He made in His image and gave dominion over everything else He made (Genesis 1:26-27).  Above everything else, for those of us who are saved, God is our Heavenly Father (Luke 11:9-13), and through belief, faith, hope, and trust in His Son, our Savior and Lord, Christ Jesus (John 10:7-30), one day we will be in His presence, for eternity (Revelations 20:11-15; 21-22), and then we'll understand it all:
Blessed be the God and Father of our Lord Jesus Christ, who has blessed us with every spiritual blessing in the heavenly places in Christ, just as He chose us in Him before the foundation of the world, that we should be holy and without blame before Him in love, having predestined us to adoption as sons by Jesus Christ to Himself, according to the good pleasure of His will, to the praise of the glory of His grace, by which He made us accepted in the Beloved. In Him we have redemption through His blood, the forgiveness of sins, according to the riches of His grace which He made to abound toward us in all wisdom and prudence, having made known to us the mystery of His will, according to His good pleasure which He purposed in Himself, that in the dispensation of the fullness of the times He might gather together in one all things in Christ, both which are in heaven and which are on earth—in Him. In Him also we have obtained an inheritance, being predestined according to the purpose of Him who works all things according to the counsel of His will, that we who first trusted in Christ should be to the praise of His glory. In Him you also trusted, after you heard the word of truth, the gospel of your salvation; in whom also, having believed, you were sealed with the Holy Spirit of promise, who is the guarantee of our inheritance until the redemption of the purchased possession, to the praise of His glory. (Ephesians 1:3-14, Matthew 12:15-21)