In practice, this is likely not the case. Numerous Kosher slaughterhouses have been shut down for animal welfare violations. During Islamic festivals, the un-professional killing of animals by individual families creates a well-noted bloodbath, shocking native Europeans. The only thing that ensures humane behavior at the cost of profit is strict laws and punishments, not vague religious obligations. Exempting anyone from the laws is a bad idea.
244 arrested in Southern California immigration sting (AP)
from the article: Europe's shudder at circumcision