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If a man wants to convert to Judaism but cannot have a circumcision for bio-medical reasons, does this prevent him from converting, or may he complete the conversion process without being circumcised?

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You mean a case where he doesn't have a foreskin? What kind of reasons are you talking about? – Double AA Nov 18 '13 at 18:19
Wouldn't not having a foreskin still require hatafat dam brit? What about hemophilia? – Danno Nov 18 '13 at 18:31
@Danno Not having a foreskin would indeed require hatafat dam brit (ShA YD 268:1). But I was looking for clarification in the question, and knowing that answer doesn't do that. – Double AA Nov 18 '13 at 19:44
@DoubleAA Understood -- I was trying to guess a condition which I thought was what the question intended because I couldn't see how a lack of a foreskin would invoke the conditions of the question. – Danno Nov 18 '13 at 20:36

There is a general consensus among the poskim that one cannot convert without having a milah. See here who refers to the views of:

שו״ת ארץ טובה סי׳ ב׳, ומשברי ים סי׳ ט״ו, זכר זכר יצחק סי׳ ג׳, מלמד להועיל סי׳ פ״ו, דעת כהן סי׳ ק״נ, ועיין בשרידי אש ח״ב סי׳ ק״ב־ק״ג שכתב שלתשובתו הסכימו כל גדולי הדור,ובכללם מרן הגאון רח״ע גדודזנסקי זצ״ל.

This is also the opinion of R. Tzvi Pesach Frank, הר צבי יורה דעה סי' רכ.

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Are these sources talking about a case where the man has a foreskin but doesn't want to have the Milah for health reasons, or where he is completely krut shofcha? – Double AA Nov 19 '13 at 3:48
@DoubleAA In a case of נכרת הגיד, the halakhah is that מילה is not meakev (יו"ד רסח:א) – wfb Nov 19 '13 at 3:53
I know that's what the Shulchan Aruch says. It's not clear (to me) in your post if these people are arguing on that. – Double AA Nov 19 '13 at 3:53
They aren't, they are מחלק between the 2 cases – wfb Nov 19 '13 at 3:54

Like everything else, it's debated!

There are opinions that he simply can't convert, that he needs no circumcision, or that he is allowed to "roll the dice" and choose to risk circumcision (let's assume a hemophiliac) for the sake of becoming Jewish. (If I'm not mistaken, it's mentioned in this shiur.)

The best bet would be to see what drugs and techniques could be used to make circumcision possible without being life-threatening.

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