Preheat the oven to 350°F and lightly grease a 1-quart baking dish.
In a mixing bowl, stir together until well blended the cream cheese, pepper Jack, sour cream, lime juice, Worcestershire sauce, pickled jalapeños, garlic, green onions, cilantro, cumin, celery salt, and cayenne.
Gently stir in the crab meat. Taste and adjust seasonings, adding more salt if needed.
Spoon the crab dip into the baking dish. In a separate bowl, stir together the melted butter and crushed crackers, then sprinkle over the top of the dip.
Bake uncovered for 30 minutes or until browned and bubbling. Garnish the top with pickled jalapeño slices. Serve warm with tortilla chips and/or crackers.