In large skillet, saute onions and garlic until tender.
Add oregano, cumin and red pepper flakes and saute for 2 minutes longer.
Add chicken broth, tomatoes and tomato liquid; bring to a boil and simmer 5 minutes
Add corn kernels
Set cod fillets on top of broth and spoon liquid over cod
Cover and simmer 5 minutes, or until cod just flakes when tested with a fork
Set fillet in middle of bowl and spoon soup around it and sprinkle with cilantro.
Garnish each bowl with tortilla strips