You know, I think I might have mentioned this before, but circumcisions are very rare in europe, outside of the jewish community and are usualy only done for concrete medical reasons. There are even some groups that consider it to be mutilation of children (although this other extreme is also a very small minority.)
I mention this because it seems to crop up in about every other story you publish.
I assure you that the chances of Harry (or a random Muggle) being circumcised is very, very small.