Be aware of the most popular Creationist arguments for a Young Earth which many of them see as their best hope in their holy crusade against evolution (and reason). Many of their claims sound like they are based in science, but they don’t stand up to even the most casual scrutiny.
If you have some time, poke through Dave Matson’s posting:
How Good Are Those Young-Earth Arguments? (1995) A comprehensive, point-by-point refutation young-Earth arguments and other creationist claims made by Dr. Kent Hovind (“young Earth creationist and dinosaur hunter”) in the Hovind-Patterson debate.