Circumcision
Circumcision is very important to most branches of Judaism, with over 90% of male adherents having the procedure performed as a religious obligation. The basis for its observance is found in the Torah of the Hebrew Bible, in Genesis chapter 17, in which a covenant of circumcision is made with Abraham and his descendants. Jewish circumcision is part of the "brit milah" ritual, to be performed by a specialist ritual circumciser, a "mohel", on the eighth day of a newborn son's life, with certain exceptions for poor health. Jewish law requires that the circumcision leaves the glans bare when the penis is flaccid. Converts to Conservative and Orthodox Judaism must also be circumcised; those who are already circumcised undergo a symbolic circumcision ritual. Circumcision is not required by Judaism for one to be considered Jewish, but some adherents foresee serious negative spiritual consequences if it is neglected.
Infant baptism
Presbyterian, Congregational and many Reformed Christians see infant baptism as the New Testament form of circumcision in the Jewish covenant (Joshua 24:15). Circumcision did not create faith in the 8-day-old Jewish boy. It merely marked him as a member of God's covenant people Israel. Likewise, baptism doesn't create faith; it is a sign of membership in the visible covenant community.