Hey, Lonnie. I see your point about the contrary evidence -- but come at it with the idea of being on a jury, and weighing the evidence.
Here we have a book, which some people claim to be the sworn literal truth of a figure that all are agreed is beyond reproach. But some people work from that truth value to advance statements not in the book, but logically derivable from it. However, we know that while the author of the book is trustworthy, he also has a fondness for using parables, poetry, and other literary forms for making his points -- it's common knowledge that parts of the book are poems, surreal images claimed to be prophecy, etc.
Now, here we have a whole lot of observations of the universe at large. We know how long it takes for hard water to lay down a thin layer of limestone under various conditions, how long it takes for a buried layer of sand to turn into sandstone. These are observable phenomena. But if limestone is laid down at 1/32" per year under these conditions, and we have a ten-foot-thick layer of limestone, how long does that tell you it took to produce that layer? We have radioactive material that breaks down at a measurable rate, sometimes very fast (so that it takes 12 hours for half of it to decay) and sometimes quite slow (Carbon-14, for example, takes about 5600 years for half of it to decay). Some of it is extremely slow, so that the time it would take for half of it to decay are way beyond the 6008 years since Creation on the Ussher scale. But by taking the amount of radioactive element present now in a given sample, and the amount of what it breaks down into that is there, we can determine how long it's been since it started breaking down.
Likewise, there are a lot of ways to measure the distance to stars and other celestial objects. And many of them appear to be doing things as we see them, which means that they would have had to be doing that as many years ago as they are light-years distant from us. So if a star is exactly 6000 light years away, and is now seen expanding slowly to supergiant size, it must have been actually doing that in year 8 after Creation. But what about another star that's 7000 light years away, and doing the same thing? Are we supposed to believe that 6008 years ago, God created it complete with light beams 992 light years towards us that showed what it would have been doing if he'd started earlier? Doesn't that seem a bit strange?
On the other hand, the idea that the text of Genesis 1 is a literal repertorial account and not a story is a human concept -- God didn't say "Listen, the parable of the Good Samaritan is a story, and Psalm 50 is a poem, but Genesis 1, now that's literal reportage!" We came up with the idea that that's what it must be. And all the YEC stuff is founded on this human idea -- not on the word of God itself. We agree on what Genesis 1 says -- we just disagree on what it was supposed to be understood as. And I think that the points it makes about what God wanted us to know about Creation are better understood when you look at it as story -- as "myth" in the Joseph Campbell sense, truth told under the guise of story -- than if you try to bend data about the world all out of shape in an effort to make it come out true as a literal news-story account. It isn't that; it's clear that it's not supposed to be that. It makes points by its repetitive style, like a story with a moral would; it doesn't have the dry narrative style of history, but the inspiring style of teaching at its finest.