Who or What is God
First of all, I would like to say what God is not. God is not a created being. God is not a man. He doesn't resemble a man in any way physically. God is not simply the figment of anyone's imagination and God is not "the man upstairs." So who or what is God?
God is a Spirit - John 4:24. A spirit is something that you and I cannot see. It is a living entity that transcends mortal understanding. In this case, God is unique more than all spirits because He is the only personage in existence who was never created and always existed in eternity past, exists in eternity present and will continue to exist for all eternity. There are many lesser spirits in the universe including the angels of God, all of mankind and Satan and his demons or fallen angels, but all of these are created beings. All spirits will exist forever as scripture will bear out.
God is the only living and true God - 1 Thessalonians 1:9. "For they themselves shew of us what manner of entering in we had unto you, and how ye turned to God from idols to serve the living and true God." People who misunderstand this have some problem with the English language as it regards sentence structure. For instance, take the word "the." When that word comes in front of something it implies that no other something exists as in "The one true and living God." If one is to believe this phrase as presented they must also believe that there are no other true and living gods, and that all who claim there are more than one are deceived or lying. When "the" is used in this manner it negates any other similar thing and makes the thing spoken of to be exclusive and singular. So we can't use "the" about two different things, or in this case, gods. So Christians have to be narrow-minded to walk the narrow road that leads to eternal life and they must believe that the God of the Bible is the only genuine god in existence. That would leave all other gods to be the imagination of men or the devices of Satan to lure people away from the "one true and living God." It can be no other way! The worship of these other gods is called idolatry in the Bible.
THE INFORMATION BELOW IS VERBATIM FROM A PREVIOUS SITE
There is only one true and living God in the universe according to the Bible, and all other gods are false gods or idols. People who worship those gods are guilty of idolatry and the teachers who promote those gods are called false prophets, deceivers, false teachers, and servants of the devil among other things. This is not a popular teaching among the people who follow the other gods; especially their leaders and holy men, however the scriptures are true. The Bible says; "Let God be true and every man a liar." (Romans 3:4) Whoa! This is too much, you might say, BUT I say unto you that if you believe you have truth to tell and you apologize for that truth, then it is not really truth to you, and that would make you a self-deceived person or a liar whose claim to believing in something is not true at all. I believe strongly that there are moral absolutes in the universe, and truth is a major one!
How can anyone honor a person who is constantly shifting positions; especially when it involves God or what men believe to be God? Of all the topics on earth discussed and debated by men, God is the most crucial of all if we believe there is an accountability to God and consequences to how we live and eternal life ahead. Here are some scriptures about the Bible's God being the one true and living God: Jeremiah 10:10 - "But the Lord is the true God; he is the Living God and an Everlasting King; at his wrath the earth shall tremble, and the nations shall not be able to abide his indignation." I Thessalonians 1:9 "For they themselves shew of us what manner of entering in we had unto you, and how ye turned to God from idols to serve the living and true God." I John 5:20 - "and we know that the Son of God is come, and hath given us an understanding, that we may know him that is true, and we are in him that is true, even in his Son, Jesus Christ, This is the true God and eternal life." John 17:3 - "And this is life eternal; that they might know thee, the only true God, and Jesus Christ whom thou hast sent."
It is very significant that when speaking of God the Bible doesn't say he is one of many true and living gods. By using THE in all reference to him, it makes him exclusive and proves that the God of the Bible alone is the only true and living God in existence!
God is Elohim - All through the Old Testament the predominant name for God is Elohim
which indicates "plurality in the Godhead." No genuine scholar of scripture will deny this, and even the best Jewish scholars acknowledge this. The Christian concept of the Trinity comes from this. A host of other scriptures have proven in a conclusive manner that there are three persons in the Godhead although the word Trinity is not in the Bible anywhere. Those three persons are God the Father, God the Son and God the Holy Ghost. This issue will be covered more thoroughly on this site.
In the Greek language of the New Testament the word for God is "Theos" in every reference. The word theos simply means God the creator and owner of all things. While there is no indication of plurality in the Greek word for God there are enough verses in the New Testament Greek text to strongly support the concept of a Trinity.