Arguing with these people is useless. You'll never convince them they are wrong since they have the Buybull on their side.
I found out recently that one of my best friends, who I knew was Christian, was also a YEC. We were discussing the new lineup of TV shows from last fall and I mentioned Terra Nova. He was unfamiliar with it so I was giving him a quick synopsis. When I finished, he looked at me and asked "You don't believe that shit do you?" I asked, "Believe what?" He replied, "That the earth is that old." When I said I did he said, "Well, I sure don't. I don't think it's but 6000 years old, like it says in the Bible."
I was stunned and quite surprised he believed this way because here's the kicker; this man is president of a company in an oil related business. I just left it alone because I knew there was no sense in arguing about it. But then, I've often wondered about the depth of his real faith. In case you haven't noticed, the first quote above is verbatim. While he doesn't "curse like a sailor,' he doesn't mind throwing a few around from time to time. He also likes to drink (he and I have tied some on together more than a few times,) and he loves making references to sex and how sexy some women are (he is married to a gorgeous woman.) And while I know to which church he is a member, I don't know if he goes on a regular basis. I really get the feeling he doesn't.
It is behavior like his that really makes me question a lot of people's commitment to religion. While they talk a good faith, they sure don't put it into a noticeable practice.