He is simply thinking in the context if today not 4000 years ago when God made a covenant with Abraham requiring Jewish males to be circumcised. Being that God is who he is.....he knew the health risks and that it is healthier for the male. Maybe not do much a problem today as it was then. But he is right God does not require curcumsision if the flesh today but of the heart. God had a reason for curcumsision and when Russell Crowe truly investigates that he will not be do quick to call it stupid,, but I dont think he really meant any harm.
German authorities accused of playing down refugee shelter sex crime reports (Reuters)
from the article: Actor Russell Crowe apologizes for anti-circumcision Twitter rant