In order to answer who God is, we need to go right back to Eden before the fall. The God who created everything was and is the Word or Logos, as John 1:1 clearly tells us. The creator God actually walked with Adam in the garden, and conversed directly with him. When Adam rejected Gods love and protection he was thrown out of the garden and the ground was cursed.
However God is not just one person as is clearly taught in Genesis, when God said 'let us make man in our image' (Elohim plural). So it is obvious that the Father God is the one who designs everything and causes everything to come about. The 'Word' was the person of the Godhead who went out and completed all that the Father had commanded or SPOKE (The Word).
The Holy Spirit is also God, and is the other person of God who accomplishes things, by acting on behalf of the Father through the Word who became flesh and we know as Yeshua (Jesus).
Yeshua when on this Earth as a human, said that He is the Way the Truth and the Life, meaning that he was the WAY God created ALL things, that he always speaks the TRUTH and he is the Only LIFE. Since he came to Earth and allowed himself to be slain by mere men, he paved the WAY to the Father in order to achieve reconcilliation with him.
I believe that Yeshua was also YHWH of the OT and the reason I believe that is because the Father cannot deal with sinful mankind directly.
That is why the WT Society, Islam, Judiasim and any other faith who do not admit that Yeshua is the only way, cannot approach the Father directly, or at all.
In the case of many JWs, I believe that they really think that Yeshua is their Mediator and Ransom saviour, but because the CULT keeps them away from Yeshua they are always depressed or frustrated. Most JWs do not even realise that the WT deny that Yeshua is the Mediator for ALL MANKIND and teach that he is only the Mediator for the 144,000. That is why I always felt EMPTY when I went to Memorials, because I wanted to partake of the bread and wine.
So the WT actually keep their SUBJECTS away from the Lord Yeshua.
HE THAT KNOWS YESHUA KNOWS THE FATHER ALSO. WITHOUT YESHUA, THERE IS NO POINT TO ANYTHING. YESHUA IS GODS LOVE MADE MANIFEST TO SINFUL MANKIND