No argument, there. If God existed, not only could there be evidence, in principle, for his existence, but there WOULD.
I just don't think it's fair to say that people who believe in god (or any other woo) aren't skeptics because there are levels to being a skeptic and no one is a 100% skeptic.
Just as well I haven't said that then

I've said that they are being unsceptical about that belief, or at the least irrational (I have traditionally equated conscious striving for rationality with scepticism), and that it seems inconsistent to be unsceptical about what I see as a pretty big issue (god).
If they
are unsceptical about this issue, that in no way invalidates their scepticism on other issues, and as there is a clear difference between imagined god and claims about real-world phenomena, I in no way equate them with other believers.
Absolutely not. Unrequited love is also love.
If you like. You would get the same molecules and neural connections as I expect you would with more readily observable love. But unrequited love is entirely in the mind of the would-be lover. It's imaginary, like god. BUT it still has an external stimulus, a real reason for its existence in the mind of the beholder. That alone makes it different from a belief in, or an imagination of, god. And it is on some level detectable, also unlike god.
This whole line of questioning is a total red herring. Neither "real" love nor unrequited love are comparable with "god", so your analogy fails.
How is it inconsistent, skeptically, if skepticism only deals with the testable?
A god that existed outside the mind (implied by the very existence of belief in it) would by definition be testable, if not now, then at some stage in the future or in the past. As of right now, with no evidence and no reason to expect any, I would suggest that even by your definition, it's sceptical to assume that it doesn't exist, and unsceptical to believe otherwise.
Demonstrations of love could be faked.
What is your point then? I took your original response as an implicit denial that love could be detected. What did you actually mean? Do you or do you not accept that love can be tested for by observing actions and by measuring physiological and neural responses? I realise the resulting quality of evidence would not be high, but it would be a damn sight higher than the equivalent for god. You would be detecting the person's
belief that they were in love
Since I didn't deny what you said I denied, it wasn't a get-out. Since it wasn't a get-out, you can continue defending the detectability of "love".
Not until you clarify whether or not you accept that "love", however it is defined, can be shown to exist either by observation of the individual's behaviour and inspiration for his or her feelings, or as per the links I posted by detecting chemical and electrical changes in the brain.
Why is unrequited love not love?
Well, I see it as qualitatively quite different, because it amounts to a desire for a loving relationship. "True love" is simply an expression of a strongly bonded real-world loving relationship with real, tangible results and benefits (social cohesion, reproduction, childcare, access to different skill sets and so on. Chemically, emotionally, sure, call it "love" if you like. And in fact it's much closer to "god" than real love, because it is entirely imagined. Yet it is still not directly comparable with belief in god, because it has real stimuli, real evolutionary and social imperatives driving it, and a real chance at fulfilment and becoming real. Unlike "god".
Also, as we've touched upon, "love" means different things to different people and in different situations. Whereas a belief in god, whatever else it carries with it, brings with it a claim to the existence of a third party - a deity.