In a large ziplock bag, combine the Ritz crackers, flour, and all breading seasonings (cumin, paprika, coriander, red pepper powder, garlic powder, salt, and ground black pepper). With the bag tightly closed, crush the crackers into a powder and mix together all ingredients. Set to the side.
In a medium-sized bowl, mix together the sour cream, mayonnaise, lime juice, lime zest, and salt. Stir well and place in fridge for 5-10 minutes to allow the flavors to come together.
Chop and mix all coleslaw ingredients together (cabbage, cilantro, onion, garlic) and place in the fridge.
Cut fish into bite-sized chunks as desired to fit nicely into the tacos.
Coat fish in breading and deep fry until golden brown or as crispy as desired.
Place fried fish on taco shells and serve topped with the homemade coleslaw and lime creme and enjoy!