High Tower, I'm pretty sure you figured out a lot of this already, but I guess I don't mind explaining more, not because I think you didn't get it but because I would like to present my viewpoint.
The film is set during the Civil War; I thought it would be fairly clear by the uniforms and weapons, as well as by the conversation at the beginning. I don't think everyone heard the dialogue, since it was rather quiet compared to the music preceding it. I considered putting a "1864" card at the beginning but didn't really feel that it would fit. I sort of hoped that the succession of people the man encounters on the shoreline would indicate that he is going into the past. I think most people picked up on that part, but I won't deny that I do sort of demand a lot of the viewer.
It's true that the film is deliberately vague, but it was really because I wanted to create a film that, like 2001 in my mind, essentially would awe the audience with an experience they couldn't quite comprehend. I consider this to be a type of storytelling as well, and I think that the reason that some people have been confused is because they were looking for things in the film (a tangible plot, a resolution) that aren't there. It's something that has happened to me before while watching movies, so I'm fairly well aware of it myself.
As for the language; I don't consider blasphemy to be adult language, though I know it will offend some. I guess we'll have to agree to disagree on that.