No, YOU don't get it.
Any 5 year old can keep asking "why"...that applies to God and everything associated with religion also. It is a silly game that gets you no further in a religious stance than in an atheist's stance. YOU can't win that one.
We can play anoyther one...if God has been here since the beginning of time, then what was there before the beginning of time? Wheeee.....
Now, take the concept of something "higher", such as your God, and then answer why other people's Gods have different morals. And why do those godly morals seem to change all the time? Oooops. Did God, the all knowing, suddenly change his mind? Of course not...people are changing their minds...as people, not by any God's actions. And people change their minds and behaviors based upon their surroundings...and the actions of those around them. Animals do, too. What gods do animals believe in, John?
No animal we know of other than ourselves has the intellect to contemplate questions such as the existence of "God."
The "Why" question is not a silly game. No matter how you slice it, there is no basis for morality without the concept of something outside of ourselves establishing it. As far as the question of "different people's God:" If there is a God what people think about him doesn't matter. He is what He is. Or you can say it is what it is. Yes, people change their minds. But that doesn't mean God does.
The bottom line is that there is absolutely no real basis for morality absent the premise of something outside of us that sets the rules. You can argue that it's necessary to have rules in order to have a society in which we can survive...that if we don't do that most will suffer. But what's best for the "average" individual in a collective often isn't what's best for a particular individual. And what is "wrong" about one individual gaining advantage at the expense of others?
With the premise of something outside of us setting the rules, the "why" question ends at "because He (or it, or they, or whatever) says so. Without that premise, there is no real answer. There is always another "why?"
If you say that having such a rule is necessary for the soceity to function, for example, the question is: "Why is it necessary for the society to function?" What is "wrong" about a situation in which the society doesn't function? What, in the final analysis, is "wrong" with us imploding and going extinct?
Absent that "something else," we are just arrangements of atoms. There is nothing important or essential about any of us. What we feel and experience is no more important than sand washing back and forth along a seashore.