Quote Originally Posted by superduperman View Post
Circumcision as we know it seems to be a purely western/Abrahamic religion phenomenon so my guess is Krypton didn't do it.
Not really, it's practiced all over the world by completely different cultures with no connection to each other, and has been for tens of thousands of years. It seems, if Kryptonians have the same exact anatomy as us, then the same practice would have been attempted in their history by some group at some point in time.

But as I said before, I see the Kryptonians as being allegorically Jewish. In science fiction, you can cherry pick stuff from the world religions and transpose it onto other alien cultures. Like the Vulcans using the hand gesture in "Live Long and Prosper," which Leonard Nimoy took from the Jewish priests in his synagogue.