I've been thinking that Atlanta is a paper tiger all season. Every time I say they're going to go down they find a way to win....
Atlanta's defense, while far from perfect, has shown itself to be very good against mobile quarterbacks and the zone-read offense, for the most part.
Also, I hate the 9ers with a passion.
That said, Kaepernick has been on fire, and SF's got a hell of a defense. If SF can force Ryan to throw the ball a lot by containing the run game, Ryan will give provide interceptions and the game will probably go SF's way.