I loved Jurrasic Park the book. I found it to be more than a sci-fi thriller. His whole philosphy about how you can't just change one thing without changing the entire course of the world is something that I ponder a lot -- Especially when I wish I could just go back and do something in my life differently. Then I remember that if that one thing were different, my entire life would be different, not just the one thing. I was pretty young when I read that book, maybe 12, and I am thinking about reading it again now.
Nelson DeMille's new book, "Nightfall," about TWA 800 is very good.
Also, if you want a VERY different Christian fiction, look at the trilogy by Ted Dekker, "Black," "Red," "White." It's too much to even begin to describe here.