Probably because you aren't in their flock or watch their TV program or get their newsletter. Evangelicals are highly decentralized. I doubt non-Catholics (or most Catholics!) could name 1 US Cardinal - or even their local bishop. Heck, I have a hard time remembering who's a cardinal these days.
I've only heard of Land because he opines on politics from time to time.
Hey, I’m just a dim-witted Catholic and I’ve not only heard of, but loved and admired Richard Land for years. Proud to have him as an ally. And now I want to hear from Al Mohler!
Lance Berkman is but Albert Pujols and Tony LaRussa no longer are. Don't blame you for not keeping up.