is that mean that the son was generated before it sent to the people?
Yes. The Son has been around for every bit as long as the Father has. Both of them have been around since before the begining. In other words, both the Father and the Son are eternal.
btw, what is the exact nature of the holy spirit?
To be honest, that confuse me even more now, what do you mean by unknowable?
The Holy Spirit is God. He is spirit. He does not have a corporeal body. He does not occupy space. He does not occupy time. He is immiment in people's lives. He moves in a through us, connecting us with God by virtue of being God present in our lives. He convicts us of sin, leads us into truth and reveals God to us. But that hardly covers all that can be said about the Holy Spirit. Indeed should I write a thousand-page post I would never cover all that could be said, and therefore never cover it exactly. The same could be said of the Father or the Son. And even then there would still be more that we simply don't know because it has not all been revealed to us, at least not yet. This is what I meant by saying that some is "unknowable".
sorry, but I think it does, how can a god be limited to something, this is what I meant by not equal in the power
Let me try an analogy. A few years ago when George Bush Sr. was President, it was known that he was a millionaire and had many investments. No doubt some of those investments would be impacted by the decisions he made as president. So as to avoid even the appearance of a conflict of interest, he had all of his investments put into a blind trust. In this way he would not have knowledge of what he owned, how they were doing, or what impact his policies might have on his investments while he was in office. He couldn't even write a check to buy his wife a birthday present from those funds. It was as if he didn't have that money. While he was in the office of president, he had so limited his access to the wealth that was indeed his, that he couldn't actuially live like a millionaire.
So, was Bush Sr. a millionaire or not while he was in office? Yes. But it didn't make any difference. He still had to earn a paycheck like the rest of us.
In much the same way, Philippains 2 tells us that the Son limited himself when he came to earth:
Philippians 2
5Your attitude should be the same as that of Christ Jesus:
6Who, being in very nature God,
did not consider equality with God something to be grasped,
7but made himself nothing,
taking the very nature of a servant,
being made in human likeness.
8And being found in appearance as a man,
he humbled himself
and became obedient to death—
even death on a cross!
According to this passage, as the Son, Jesus was by nature God. (This would be before his incarnation.) And then he took on the nature of a human being. Notice he didn't quit being God. Therefore, he retains his divine nature. But because he also took on the nature of a human being, either he is going to live as a divine human being (half man/half god) or he is going to live exactly as a human being (having limited his divine power) while living as a man on earth. So, he is no less God than before, just as Bush was no less of a millionaire than before, but neither Bush nor Jesus could claim access to that we was truly theirs for as long as they were in the position which they entered into as president (Bush) or servant human being (Jesus). The fancy theological term used to describe this is kenosis -- which is the Greek word translated in verse 7 ("made himself nothing", literally "he emptied himself") -- meaning emptying. This is why I say that he limited himself, because he did not claim any of those divine powers while on earth, even though he was still just as much God as ever.
Ironically, I find that more Christians get confused by this next concept than Muslims do. The question then becomes, if he had limited his divine power so that he functioned just as all other humans do, then how did he do all of the miracles that he did? Wouldn't he have had to have been God to do that? And I say, that he did them by the power of God, the Holy Spirit, that was present in his life, just as that same Holy Spirit, and thus the power of God, is available to any other human being today. It was because, unlike us, Jesus lived a truly submitted life to the Father, that the Father was able to do things in and through him that we never do. If God willed them for us, and we were as submitted as Jesus, then we would see them in our lives just the same. And in fact, if you take a look at the disciples, we do in fact see them doing many, in some cases more, of these very sorts of miracles themselves.
But anyway, I hope you can see how Jesus who was God before he was incarnated, doesn't become less God simply by that act of putting on flesh, but he does voluntarily limit himself (empty himself) of those powers which we humans tend to associate with God like omniscence and omnipresence. But because he is God, he is never less holy, never less divine; his essential character remains the same. But like people, he will now get hungry, tired, and feel sorrow.
how it can be that God has been always generating the son?
I didn't say that God has always been generating the Son. I said the Father has always been generating the Son. God has always been Father and Son and Holy Spirit all three at the same time. If we were to assume a point in time in which the Son never existed, then without the Son, there can be no Father. And since the Spirit proceeds from both the Father and the Son, then there can also be no Holy Spirit. And if there is no Son, no Father, and no Holy Spirit, then in fact there is no God.
My guess is that this is still confusing, so let me go back to the bit about if there is no Son, then there is no Father.
I don't know whether or not you have children Saya, but I do no you are a child. Perhaps like me you are the oldest in your family. Now, while my father existed before I was born. He was not yet a father until I was born. His fatherhood was entirely dependent on generating me as his son. Without me as his son, he was not a Father. Now, some people like to conceive of God in just this way, existing in heaven by himself and then having a Son. But those who think this way are not thinking in accordance with what Christianity understands the Bible to actually teach. We understand that the Bible sees God has having always been the eternal Father. That Fatherhood is one of the basic natures of who and what God is. Thus, if he has always been the Father, then there also must have always been the Son.
When we speak of God sometimes we do speak only of the Father or only of the Son or only of the Spirit. But just because we sometimes focus on God's Fatherhood, or his Sonship, or that he is Spirit doesn't mean that these other aspects of who God isn't don't exist at the same time. The one and only God who created the universe, who called Abraham into covenant with himself, who called for Moses to lead his people, who sent Jesus into the world, and who spoke to Muhammad has never changed in who he is. But when we look more closely at his divine being, we find that while it in essence he is one, that there do exist these three persona by which he has made himself known, and none of them is any less God than another.
BTW, Ahamad Deedat, got it wrong when he said in that video that the Catechism says that the three persons are just one person. No Christian catechism actually says that. We say that there are three persons, but just one being. And we don't use person to refer to the concept of individuals either, the Greeks who coined that phrase didn't mean by it what is generally meant by the venacular of the word in contemporary English usage. When they spoke of persons, what they meant was something more akin to personas than to individuals. So, don't depend on him to get your understanding of the Trinity. He doesn't really talk about the Trinity that Christians believe in, but has created his own version of it -- one that Christians don't believe in any more than he does.
