PEEPIN' STEPHEN: Stephen Baldwin, a born-again Christian, plans to snap photos of license plates of people going into a Nyack store once it's a sex shop, then publicize their names. Photo: Djamilla Rosa/WireImage.com Actor Stephen Baldwin has his shorts in a bunch over a sex shop opening near his estate in Rockland County..... The least-known of the Baldwins, Stephen, a born-again Christian, parked himself outside the Route 59 location in Nyack and took snapshots of construction workers walking in and out of the building. Once the smut shop opens in a few months, the 39-year-old star of "The Usual...