When I was young, my mother would say, "Don't sink to their level," whenever kids were antagonizing me for whatever childish reason they could dream up at the time. But I had a great childhood, don't get me wrong, and this defense wasn't needed much.
So why am I reflecting today? This phrase often springs to mind when I read of other atheists struggling in their debates with theists. I don't mean to ignore theists or that they are below us. Instead, what I'm saying is, look at their argument first and decide if it even deserves refuting or addressing.
For instance, someone on the Thinking Atheist forum recently looked for help dealing with a theist who tried to explain how Adam lived to more than 900 years old. Their reasoning was that there was very little disease back then so people were much more pure and able to live longer. My mother once used this defense and believed it wholeheartedly. At the time, I tried to just use common sense to dissuade her from this thinking, but I quickly realized she was beyond help, as are most theists.
It was later on that I stepped back from this argument and realized I had been approaching it all wrong. Did I believe Adam lived 900-plus years? Of course not. But what I did believe in was evolution, which proves Adam didn't exist. Why expend any energy trying to prove someone didn't live 900 years when you can dismiss that person altogether? And that's what I mean by, "Don't sink to their level." Don't legitimize their argument by trying to refute it on their terms when you can just destroy the argument from another angle.
This basically works for most, if not all, Genesis arguments. Moses lived a few centuries? Nah, he didn't even exist. Noah lived 500 years and built an ark with a handful of unskilled family members? Nah, the Epic of Gilgamesh supersedes this plagiarized fable, so why argue it's impossible for him to build the ark? Or live that long for that matter? Don't sink to their level. It's the main reason scientists refuse to debate creationists, because they don't want to legitimize their ignorant looney worldview.