Read some of your material in the link.
There was so much of it that I cannot even find again what I want to refer back to.
In one case, the statement that those who heard the voice of God - didn't. Rather, they came to understand what God wanted - something like that.
This claim is not in accordance with scripture. In the prophet's Samuel's case, as a child, or teenager, he was called - was it 3 times, before he was made aware by the priest he consulted what he had to do to respond to God's verbal calling. Other prophets received verbal messages, or visions from God that were very specific, just look at Ezekiel's, even Daniel's writings.
That the above doesn't do much to tell us what or who God is, it does tell us that God is real and acts with real time events with his servants. An example is a young prophet who didn't follow exactly, didn't obey exactly, what he was told to do. He was killed for his disobedience by a lion that afterwards acted very un-lion-ly -- thereby demonstrating to those who knew about these things that this was God's judgment which was further confirmed when a prophet received a message explaining things.
"you are left with a God whose essence is unknowable and indescribable"
That is only the case for those who ignore what God reveals about himself, while also ignoring what God does, his acts that even today are mocked as being stories, inventions, by those who want to make a god for people to worship, rather than God actually existing and being able to do these things.