If you go off the original book, "Do Androids Dream of Electric Sheep" I'm pretty sure that he wasn't (working from memory), but the movie, Blade Runner has taken on an existence that has by far outshadowed the book. I've recently come across an interesting link on io9...
A few precious pages from an early screenplay for Blade Runner have turned up online, and they're radically different than the version you saw on screen. They end with Deckard realizing he's a Replicant. Blade Runner went through many drafts on its way to the screen, and that's not even counting the last-minute revisions that added a new voiceover. For years now, we've had the July 24, 1980 version by Hampton Fancher, and the February 23, 1981 revision by Fancher and David Peoples. (Fancher didn't want to make some of the changes director Ridley Scott kept insisting on, so Scott brought in Peoples to do them.)
But now another Fancher draft has surfaced at GameOfTheArt.com, and it's dated December 22, 1980. (It appears to be genuine, but as always, you never know.) If it's real, this might be Fancher's last stab at the screenplay before he handed it over to Peoples. Also, there are a few pages of cool-looking storyboards, and here are a few images from them.