There are several takes on this, as you've just noted from the various posts above.
One of the reasons is that the term "God" lacks a clear, coherent definition when one asks this question. Are we talking about Jesus, as Christians define God? Are we still talking about "Jehovah God," as the Watchtower defines God? Are we speaking about the Jewish definition of God (and then which one, something like Orthodoxy or more like Spinoza's or Modeca Kaplan's non-personal take)? Are we talking about Allah of the Islamic religion? Or are we speaking about something else entirely?
While not acknowledged by Watchtower theology, the Hebrew Bible does have an evolutionary development of YHWH similar to a character development in a modern novel. The God of Abraham is not the same "God" in the Torah as He is in the Prophets or after the Babylonian Exile. This is recognized even in the Talmud. The reason is that the Jews developed their theology about God via revelation, whether that revelation was developed by the hands of man or you believe it was divine (or a combination of the two).
Regardless, the take is always the same: YHWH is discovered (or discovers the Hebrew people), and is one God among many that the Jews worship. The Jews lose the northern part of their territory to foreigners and then end up having their king and capital exiled into the land of Babylon.
They search for a reason for why this is so. Their religious priests tell them it is because they should have been worshiping YHWH and only YHWH instead of the pantheon of deities that they had been serving. So they reconstruct their religious and cultural observances into a liturgy praising YHWH, claiming that they had sinned against Him and must repent in hope that they would be released from exile and returned to their land.
And they were. This reconstruction seemed to work--for a while. This new theology, namely that God sends down punishment upon people and nations for the sins they and their ancestors commit seemed to be true, until the Hasmonean dynasty of 100 years fell.
And after that the Second Temple fell. And after that the Bar Kokhba Revolt was a disaster. And then there was the Diaspora, and the Crusades and pogroms and the Spanish and Mexican Inquisitions, and finally the Holocaust.
It was at the Holocaust that the Jews finally abandoned this theology. God does not punish any nation or children for the sins of their fathers. It was not merely the evils visited on the Jews that made the Jewish people consider this. When the Jews were liberated from the camps after WWII those that lost the war were faced with even worse terrors. Consider the horrors of the two nuclear weapons dropped on Japan to end the war. Did God do this to save the Jews? The answer was that the Jewish theology that YHWH punishes his children was flawed from the very beginning.
While I cannot answer why some Christians not only still hold onto to these views and even cherish them like Jehovah's Witnesses do, you sometimes have to move pass the texts you revere as holy in order to cherish them as holy, otherwise you do a disservice to them and others. Our desire to define an Ineffable God is impossible. We cannot define that which cannot be defined. Moses cannot give God a name. God is the one who names Moses.
