Obviously someone who is a Biblical literalist believes that the Bible should be used as evidence. (Obviously not in the science forums.)
The Biblical and belief arguements are, I think, sidelines for a few here. They like to argue so they indulge in those threads when the science forums are quiet.
Most of us (me for sure) don't worry much about what individuals personal beliefs are. What we are all against the the idea that there is any such thing as "scientific creationism" that should have any place whatsoever in schools. This is what this site is primarily about.
I would suspect that the majority of the literalists think that there is some scientific support for their beliefs. They charge in with material from AIG and ICR and when
that material is laughed at start to degenerate into rudeness much faster than most of the opposition.
The believers here, as Jar, points out are much more concerned about the non-science aspects of the literalists position. It is also bad theology and bad for the view that the world holds of Christianity. The sooner everyone treats the literalists with the derision they deserve and gets the separation between them and more thoughtfull, sophisticated Christians clear the happy most Christians will be.