I would sincerely doubt it. Bierce was a satirist, even his ghost stories show this touch, as do his stories of the Civil War.
As near as I can tell from a biography, he was agnostic.

Some of his many short stories, and the "Devil's Dictionary," are here:
http://www.online-literature.com/bierce
Bierce

Try "An Occurrence at Owl Creek Bridge."
He was an excellent writer who was not above twisting a knife in the reader; he should be much better known.