I certainly respect skepticism
You probably already agree that the faith-based thinker (and much of the lay public) uses the word to mean something different than the critical thinker, who simply means that all claims should be subject to critical analysis before being believed. The faithful generally mean that they don't believe an idea when they use that word. When I say I'm skeptical, I mean that I don't accept anything as truth just because it was said or written, that there is an empirical test that must be passed before belief. When the creationist uses the same word, that's not what he means. He means that he has already rejected the idea usually with the wave of a hand because it conflicts with his faith-based beliefs.
Another mistake made is to assume a day in the Bible is an earth Day.
I just had to comment on what I think is the first post from you've I've read that wasn't a criticism of American liberals. But I also wanted to make the argument for why you are probably wrong. The biblical creation myth authors like all other creation mythicists, took their best guess as to how all of this got here, and guessed wrong. I'm sure that that's something that you would agree with if we were talking about any of the now defunct religions from history, but not if it appears in your scriptures. Then it cannot be error, so the motivated reasoning begins to try to make the language conform with the science better, and it includes a day not being a literal day, because we know that that is incorrect. But the evidence against that reading is threefold. First, there is no reason to assume that the word doesn't have its literal meaning, no indication that it is a metaphorical usage. Second, the days of creation contain a morning and an evening. And third, the seventh day is a day of rest, and one is commanded to emulate God by resting from one sunset to the next - 24 hours.
"Almost every man alive can trace his origins to one man who lived about 135,000 years ago, new research suggests. And that ancient man likely shared the planet with the mother of all women."
I think that demonstrates that there has been Adam and Eve.
It does not demonstrate that there was a first mated couple, nor that these were the first human beings - just a common ancestor.
what I know about the speed how DNA is degenerating
It's not. You should look at science resources, not creationist sources, whose agenda is not truth as defined by a critical thinker, but rather, the promoting of religion by any effective means.
I think that is not working explanation.
Except that it works fine and is compatible with the available evidence. Do you have any reason for rejecting that besides faith in something else?
if there is not first human(s), then it means we don't have a good definition for a human.
We don't have a definition for human being that allows us to identify a first one. There isn't even agreement about its species. Some mean Homo sapiens, but some mean any creature of the genus Homo, which includes H. erectus and H. habilis, and some include any hominid, which goes back to the break with the chimp line and includes the genuses Homo, Australopithecus, Paranthropus and Ardipithecus.