Is Christianity against circumcision and is it really required by Judaism and Islam?

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I know a lot of Americans are circumcised but what does christianity actually say?
its a pretty hot issue for obvious reasons but i want to know religions official stance just out of curiosity
I think christianity is against modifying the body isnt it? like its against self harm and against tattoos and things like that isnt it? is there an actual passage or is there any mention of circumcision in the bible?