If they are creationists my guess is that they don't want to be.
Over the years, I've been involved in creation vs. evolution threads on various "debate" boards where posters who were actual biologists, geologists, astronomers, etc., who had way more patience than I, tried very hard to explain the evidence available in support of evolution and the theory that explains it. Obviously, an intenet "debate" board is a horrible medium for presenting immense volumes of data, but to their immense credit, they tried.
All to no avail. The creationists simply would not look at it, acknowledge it, accept it. No matter how much evidence was presented the creationists would ignore it all and continue lying about it all, claiming it doesn't exist.
It gets to the point where you don't even attempt to convince the hard core creationists anymore. The place you finally get to is the need to present the evidence to the casual readers, lurkers, passers-by who may have stumbled onto the thread, hoping that one or two of them who may still be on the fence will discover that despite what the creationists say, there is a vast amount of evidence in support of evolution.
Creationism IS slowly dying off, but not because the hard core creationists are changing their minds. It's because their children are seeing through the lies.
Yea, I think we all are aware of the "characters" who roam forums that just sit in a position of indefinite denial.
I don't think internet forums accurately depict the larger picture of who makes up creationists today. The internet might be like 95% in denial (the usual characters), and 5% on the fence, but I'd say in the real world that's probably reversed where maybe 95% of creationists either don't know or potentially don't really even care about the origin of species, whereas a much smaller percentage actually are at odds with science . As odd as it sounds.
So I usually try to give people the benefit of the doubt if they are new or if I don't recognize them.
But like you said, it can be difficult disseminating large amounts of information, particularly complex scientific information, over an internet forum.
The guy above is talking about DNA of hominid species out of Africa and it's like watching Christopher Columbus sail the ocean, knowing that he's just a spec in the ocean that likely isn't aware of just how vast the earth is around him. I find that many creationists, in real life, just aren't even remotely aware of what we know. Not that they should be unless they themselves are scientists. But to be fair, most people in society at large are not scientists, let alone Christians who might have some kind of stigma or reservations about science. So why should we expect Christians at large to understand? Im not a theologian, why should anyone expect me to be aware of theology? I'm not a farmer or a house builder? Why would I know how to build houses? And the same applies for science. If they aren't scientists, I don't think we should come out the gate expecting them to be aware.
And I remember many years ago when I first started studying science in college. Geology in particular. And I was once asked what the big bang theory stated. And I responded by saying "well, it's when a supernova exploded".
And that's the only thing that I can guage non-scientists to. Where was I before studying geology? That's probably where most of them are now or today. And that is a "dark" place. But they can't see that, only we can. Little did I know that after 15-20 years later of endless study in geology that my world view would be far far different than it was back then. I had no idea about the vastness of what I didn't know.
And the usual "characters", they create a facade. Like using a sharpie marker to paint muscles on a 10-year-old, to make it look as if the 10-year-old could beat mike tyson in a boxing match. But people truly familiar with boxing know that the match was long over before it even started.
I digress.