This asks the same question I always asked myself about Mormons. Isn't the world--life--love--beautiful and amazing and weird enough? Why do they need to add all their JS holy polygamous prophet and temple mumbo-jumbo into the mix, and make life so unpleasant?
I've been to the Battlefield, I love the music, I think that actor Jeff Daniels (who usually seems so bland to me that he blends in with the wallpaper) turned in a dazzling performance as Chamberlain. (Chamberlain, BTW, is one of my personal heroes. Read about his achievements in and after the war, and what the guy accomplished - despite living with a permanent disability from Gettyburg.)
The book that the movie was based on, "The Killer Angels," is a good place to start. I had to read and re-read it a few times before I understood "who was on first" in the movie.
One of my all-time favorite high school teachers attended Bowdoin College, of which Chamberlain was president several times, and according to one biography I read, over the course of his career there, he taught everything but math. And he taught several languages (the number sometimes varies according to the source.) Anyway, my former teacher told me that when he was a kid, whenever the boys wanted to play "Civil War," everybody wanted to be Chamberlain. He was their hero. (This teacher grew up in Maine.)
Gettysburg is my favorite movie. Just the music throughout the movie is very stirring. IMO, another spiritual dialogue is when Colonel Chamberlain is addressing the rebellious troop from Maine that was just put in his charge.
I bet you liked (or will like, if you haven't seen it) the music in "The Last of the Mohicans." I believe the music was written - or co-written by the same guy, Randy Edelman.
"Crom, I have never prayed to you before. I have no tongue for it. No one, not even you will remember if we were good men or bad, why we fought, or why we died. No, all that matters is that two stood against many, that's what's important. Valor pleases you, Crom, so grant me one request, grant me revenge! And if you do not listen, then to hell with you!"
Maybe not all that "spiritual" but as far as meaningful discussions, this is just one clip from one of my favorite movies of all time. The whole movie is really one big discussion about the meaning of life.