Hot answers tagged brit-milah
In order to convert one has to accept all the commandments, which includes circumcision. If one would clearly not want to accept one of the commandments no Orthodox Rabbi would do such a conversion. http://www.hebrewbooks.org/pagefeed/hebrewbooks_org_12136_14.pdf
Circumcision is one of the Torah's 613 commandments (#86 of the רמב"ם's list; בראשית יז:י). A convert to Judaism has to accept all of them. If he does not accept even one of those commandments, he is not accepting Judaism, and has not converted. If he accepts that is a valid commandment but doesn't wish to fulfill it, he might as well not convert, so ...
If the brothers knew about it, they would have known the reason - that they were forced to do it in order to obtain food. Yosef, as the second in command, would not have been forced due to his position (giving out the food to everyone else). So the fact that he was circumcised would have had to have been for a different reason. ברוך שכוונתי וכו
Kli Yakar explains that one who has relations with an Aramis (gentile) his Orla gets stretched (Moshcha Orloso). He wanted to show the brothers that he is the same Tzadik and did not sin while he was in Egypt.
As Shalom alluded to there are two ways to evaluate circumcision vis-a-vis a Ger. One is that it is part of the process of becoming Jewish (for a man). In that case, there is really nothing to start with - if he isn't getting a circumcision it isn't doing the process, he doesn't become Jewish. However, in the case where he can't have a circumcision, there ...
Per Chabad.org it is permitted כשעושים סעודת ברית מילה או פדיון הבן במוצאי תשעה-באב, מותר להזמין כמה אנשים שרוצים, וכולם מותרים אז בבשר ויין
Just a guess, but probably the wound having healed from childhood would look very different than an adult's fresh one.
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