Why do christians don't circumcise although jesus was circumcised?

For example in Europe and south American countries they don't circumcise except for phimosis or having HIV virus etc. In quran Muhammed could be uncircumcised but in bible it mentions that Jesus was circumcised so why do many nations in Europe don't circumcise unless medical or hygienic grounds. That's really confusing me.

Why do christians don't circumcise although jesus was circumcised?
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