"Most people aren't aware that Islam, not just Judaism, requires male circumcision."
That's because both of them have Abraham, who God told to get circumcised, in their lineage. Which is true BTW.
Why don't the Muslims circumcise babies according to the biblical directions (on the eighth day after birth)? Is it because Ishmael was circumcised when he was 13?
Most people aren't aware that Islam, not just Judaism, requires male circumcision."