You're ignoring the existence of claims and beliefs.
A belief is the acceptance of a claim.
A claim is a statement or assertion of belief.
Problem?
Yes a coin flip is A or B. A belief about a truth statement concerning a claimed result of coin flip is not.
But in both cases, there is an actual result from a coin flip. Therefore, any given belief about a truth statement concerning a claimed result of coin flip is either only true or false.
A failure to accept the truth statement 'The coin landed heads' does not require me make the contrary statement 'The coin landed tails'.
So you claim the coin is not necessarily heads nor tails.
David Hume: "In our reasonings concerning matter of fact, there are all imaginable degrees of assurance, from the highest certainty to the lowest species of moral evidence. A wise man, therefore, proportions his belief to the evidence.”
So you solved Hume's Problem of Induction? If a matter of fact exists, it will only exist in an absolute sense. You can't contradict yourself on claims of fact. The Problem of Induction has never been solved, nor can it be solved, because it is by nature inductive. Not EVERY claim is inductive.
When dealing with claims concerning the existence of God or gods, what is the presumption I should take?
You going to sit there and tell me that theism is a criminal trial?
My answer:
"Appeal to ignorance - the claim that whatever has not been proven false must be true, and vice versa. (e.g., There is no compelling evidence that UFOs are not visiting the Earth; therefore, UFOs exist, and there is intelligent life elsewhere in the Universe. Or: There may be seventy kazillion other worlds, but not one is known to have the moral advancement of the Earth, so we're still central to the Universe.) This impatience with ambiguity can be criticized in the phrase: absence of evidence is not evidence of absence." -Carl Sagan
In other words, you can't make any conclusions either way, regardless.
Period.
A statement of belief or non-belief
is still conclusive; regardless of whether or not you claim it's "provisional."
Again, because you have no justification for your rejection of the claim. All you have to go on is my claim that my license is valid. It may be either true of false, but you don't have sufficient information to determine the truth value of the statement.
But at the same time the truth is only either "valid" or "expired." If I am really honest about my stated un-belief of your claim, then I am gambling that the license is expired. However, if I was intellectually honest, I would simply state, "I don't know," without making a belief claim
for or
against.
You believe the Christian God exists. I don't believe your truth statement. Are you implying that in order not to believe that truth statement, I need to prove a negative?
No, I just want you to admit that you're making an appeal to ignorance.