The reason that circumcision will not become a dead practice among practicing Jews is that it is not done as a result of antiquated medical beliefs, to prevent masturbation
, as a rite of passage
, or anything of that sort.
The removal of a Jewish male's foreskin on the eighth day of his life is a symbol of the Covenant that the Jews made with God when they were given the Torah.
As the story goes, the Lord asked the Israelites what they would give Him to insure that they would follow His Word, and the answer that He accepted was "our children". Ritual circumcision is symbolic of that promise.
More Orthodox members of Judaism sometimes hold the belief that uncircumcised Jews are cut off from God, and when a non-Jew converts to Judaism, circumcision is a mandatory part of the process. Even those adult males who were circumcised in the hospital will undergo bloodletting from the penis when they convert to Judaism as a way of affirming their commitment to the Jewish people's Covenant with the Lord.