Preheat oven to 350°. In a skillet, heat 1/2 cup oil over medium-high heat. In batches, fry tortillas until pliable (do not allow to crisp), about 10 seconds on each side. Drain on paper towels. Cover with foil to keep warm and softened., In a large skillet, heat remaining oil over medium-high heat. Add tomatoes, onions, garlic and cumin; cook and stir until onions are tender, 3-4 minutes. Add shrimp; cook, stirring occasionally, until shrimp turn pink, 3-4 minutes. Stir in spinach; heat through., Place 1/4 cup shrimp mixture off center on each tortilla; top with 1 tablespoon cheese. Roll up and place in a greased 13x9-in. baking dish, seam side down. Top with sauce; sprinkle with remaining cheese., Bake, uncovered, until heated through and cheese is melted, 25-30 minutes. If desired, sprinkle with cilantro.