None.
Similarly, no one can truly explain how God could simply speak light into existence (Gen 1:3). Speaking light into existence is impossible, so how would any human be able to truly explain it? Humans have trouble enough explaining the possible, forget them explaining the impossible. But that does not mean the impossible did not happen or does not exist.
With that said, let me continue to offer at least something to think about.
“In the beginning was the Word, and the Word was with God, and the Word was God ... The Word became flesh, and lived among us. We saw his glory, such glory as of the one and only Son of the Father, full of grace and truth” (Jn 1:1,14).
These verses indicate the dual nature of God as both a Heavenly Father and Human Son. Of course, such seems an impossibility with us humans. How can anything “be something” and at the same time “be with that something”? But as Jesus said, “With men this is impossible, but with God all things are possible” (Mt 19:26).
In the Old Testament, we have these two passages. “In the beginning God created the heavens and the earth. Now the earth was formless and empty. Darkness was on the surface of the deep. God’s Spirit was hovering over the surface of the waters” (Gen 1:1-2). “Do you thus repay the LORD, you foolish and senseless people? Is not he your Father, who created you, who made you and established you?” (Dt 32:6).
These verses indicate the dual nature of God as both a Heavenly Father and a Holy Spirit. For whatever reason, most people don’t quibble with this dual nature of God, but many outright reject the dual nature described in John 1.
In the world of science, there is something called the “dual nature” of light. In some ways it acts like a wave and in other ways it acts like particles. If that were not enough, the electron too, a tiny sub-atomic “particle”, at times acts like a wave. It too has a “dual nature”. Scientists really cannot explain the paradox, but just accept it as fact. Therefore should it be any real surprise that the creator of such things also has a dual nature, or even a tri nature? Although those scientists do not fully understand the dual nature of light and electrons, they don’t let that stop them from continuing their work as scientists. In the same way, although a Christian may not fully understand the tri nature of God, he or she doesn’t let that stop them from being servants of The Almighty.
When you think about it, should we honestly be surprised that there are some things about the Creator of the Universe and the heavenly realms that we do not completely understand? For instance, how can something speak a universe into existence? Obviously we have no clue how that worked, but the Bible is clear that that is exactly what God did.
"’No’, the angel replied. ‘You don't need to know my name. And if you did, you couldn't understand it’" (Jdg 13:18, CEV).
"Can you compare me to anyone? No one is equal to me. You cannot understand everything about me. There is nothing like me” (Isa 46:5, ERV).
I mean, how would one describe the color red to a person born blind? However, with the above background, maybe you’ll find the explanation below helpful.
God wants a proper father-child relationship with humans. There are two ways of going about that. One is to provide an example of that, and the other is to write a “How To” manual that explains what he (God) is looking for. The New Testament accomplishes both. As prophesied hundreds of years earlier (Isa 9:6), God sent himself in the form of a “son” to provide a perfect example for us humans so that we could observe exactly what he (God) was wanting in a relationship with human beings as his children. This perfect sinless “son” also was able to be used as a sacrifice to atone for the sins of mankind. We read about this example, named Jesus, in the gospels. The rest of the NT is basically a “How To” manual that complements the gospels in showing humans how to have the kind of relationship God desires with everyone.
This teaching that Jesus is God isn’t just interesting theology, but very important--actually a matter of eternal salvation. Below are the key verses:
“God said to Moses, ‘I AM WHO I AM,’ and he said, ‘You shall tell the children of Israel this: “I AM has sent me to you”’” (Ex 3:14).
“He said to them, “You are from beneath. I am from above. You are of this world. I am not of this world. I said therefore to you that you will die in your sins; for unless you believe that I am [he], you will die in your sins.” They said therefore to him, “Who are you?” ... The Jews therefore said to him, “You are not yet fifty years old, and have you seen Abraham?” Jesus said to them, “Most certainly, I tell you, before Abraham came into existence, I AM.” Therefore they took up stones to throw at him, but Jesus was hidden, and went out of the temple, having gone through their midst, and so passed by” (Jn 8:23-59). (Note that the word “he” as in “I am he” is not in the original Greek. The Jews did not immediately catch what he was really saying until he put the phrase in a more obvious context.)
The reason why the Jews wanted to immediately stone Jesus was that in their minds he was blaspheming, calling himself “I AM” (i.e. God; see also Jn 5:18 and Lev 24:16). Unless one believes Jesus is who he says he is (the Great I AM), they will die spiritually. Those Jews failed to understand Isaiah’s prophecy about Jesus about 500 years before where a “son” would be born into the world who would also be called “God” and “Father” (Isa 9:6).
So Jesus was both “the Son of God” as well as “God”. When you find someone who has a complete 100% understanding of God, ask them about it.
This is just extra. Even non-Christians recognized that the early Christians believed in Jesus as if he were God.
“Pliny then details the practices of Christians (sections 7-10): he says that they meet on a certain day before light where they gather and sing hymns to Christ as to a god.”
http://en.wikipedia.org/wiki/Pliny_the_Younger_on_Christians