The evidence is provided as
The Person
The Revelation, and
The Message.
From those sources, all we will ever know of God can be found. They contain the facts and proofs.
Now if we say God is all knowing, what is provided in the evidence to prove to us God is all knowing?
That is all one can say, as exploration of that answer is not this OP.
Regards Tony
Let us return, then, to your OP, and the "evidence," as you put it.
The Person
What do you know about this "Person?" All you can ever know, about anyone (any one of the thousands of humans who have claimed to come wih "messages from God") is what they say there are. You cannot observe them getting this message. You have no ability, no means, of testing whether they have "qualities of two separate natures," the human and the divine or spiritual. Only what they say. Such men have included, as I have pointed out before, Joseph Smith, David Koresh, Sun Myung Moon, Marshall Applewhite, Jim Jones, and many others.
These "Persons" have also included the virtually certain-to-be mythical, like Abraham and Moses. And if they are mythical, then their "message" was actually written by somebody else, who you do not claim to have been a "messenger."
What you do NOT have is any corroborating evidence whatever to indicate that these "persons" are who and what they say they are. So, the "evidence" that you accept as evidence of the divine is your own predisposed selection of what and who to believe. In other words, you are all the evidence you need of the "Person."
The Revelation
How many of the "Revelations" that you claim have been given to man by God have you studied, and how have you compared one to the other in order to determine if they are in any way cohesive -- something that one would certainly expect if they are all coming from the same, omniscient source. God cannot, surely, be expected to be "more omniscient today than yesterday," as this would absolutely deny the meaning of the word omniscience itself.
Now, let me ask you to consider whether many of these "Revelations" have set humans against each other, resulting in untold war, misery and death? Can it really be that this is what God wanted to accomplish? Or is it possible God did not know that would be the result of asking one culture, in one place and time, to believe something absolutely for centuries or millenia, and then sending along a new "Revelation" to say, "okay, stop that and believe something else now."
But let me assure you, religious dispute has, throughout human history, been a terrible reality, and has resulted in exactly what I said: war, misery and death.
The Message
This is going to be your hardest challenge, because here's what we can say with certainty about any "Message" enjoining us how to live, worship and engage with one another for the purpose of improving human future: that you caannot and will not know whether it is a "Message" of real value until that future has arrived. Thus, you must take that 100% on trust.
Unless, of course, you reflect that if the "Message" has changed many times (as you yourself affirm that it has), that previous "Messages" have indeed been failures. And if you assume, as you have suggested, that at some remove in the future some new "Messenger" will come with a new "Revelation" and a new "Message," that this one will be, by that time, known to have not been all that it was cracked up to be either.
Can you see why some of us remain sketical?