This may well be the case so I am not douting you, but do you have statistics that bear this out?
I think that neither is the case. Indeed there are anti-semites and anti-Muslim bigots out there in Europe, but I don't think there is institutional anti-semitism in most of Western Europe even though there used to be.
I don't actually know what motivates this ban, but I will let you know what I think on the matter.
I think from the point of view of what parents should be permitted to do with their children there is no defence that doesn't rely on special pleading. Having said that, I would not support a ban on male circumcision and know that my grounds for saying this is also special pleading. I am not opposed to it because on the whole I think that risks are too low to go to all the trouble of upsetting religious and ethnic groups who practice it. It's a pragmatic opinion.
Well, give or take a Ku Klux Klan or two and nativist hatred of immigrants in the 19th Century, it probably is true that American anti-semitism is not as virulent as it was in Europe in the 1930's.
Anyway, it's not quite true that nobody has ever thought to make an issue of it (ritual slaughter) in the US:
http://en.wikipedia.org/wiki/Bans_on_ritual_slaughter#United_States