Ignoring the religions aspect and masturbation, it's actually healthy to be circumcized because there's some unhealthy bacteria that usually gather in that area. When a person is circumcized, said bacterias evolve much, much harder.
Also, it's not like it stops masturbation, it just makes it harder.
Edit: Since people like to quote this upper part and say "oh, maybe if you don't wash" or other crap, here, some links that explain better all the benefits of circumcision:
http://www.nhs.uk/Conditions/Circumc...dvantages.aspx
"There are several potential advantages and disadvantages associated with circumcising boys shortly after they are born.
For example:
Circumcision reduces the risk of developing a urinary tract infection (UTI), such as a bladder infection.
Circumcision reduces the risk of getting some types of sexually transmitted infections such as HIV.
Circumcision reduces the risk of developing cancer of the penis."
http://www.nytimes.com/2012/08/27/sc...says.html?_r=0
"The American Academy of Pediatrics has shifted its stance on infant male circumcision, announcing on Monday that new research, including studies in Africa suggesting that the procedure may protect heterosexual men against H.I.V., indicated that the health benefits outweighed the risks. "
http://www.mayoclinic.com/health/cir...N=why-its-done
"Circumcision might have various health benefits, including:
Easier hygiene. Circumcision makes it simpler to wash the penis. Washing beneath the foreskin of an uncircumcised penis is generally easy, however.
Decreased risk of urinary tract infections. The overall risk of urinary tract infections in males is low, but these infections are more common in uncircumcised males. Severe infections early in life can lead to kidney problems later on.
Decreased risk of sexually transmitted infections. Circumcised men might have a lower risk of certain sexually transmitted infections, including HIV. Still, safe sexual practices remain essential.
Prevention of penile problems. Occasionally, the foreskin on an uncircumcised penis can be difficult or impossible to retract (phimosis). This can lead to inflammation of the foreskin or head of the penis.
Decreased risk of penile cancer. Although cancer of the penis is rare, it's less common in circumcised men. In addition, cervical cancer is less common in the female sexual partners of circumcised men.
Circumcision might not be an option if certain blood-clotting disorders are present. In addition, circumcision might not be appropriate for premature babies who still require medical care in the hospital nursery.
Circumcision doesn't affect fertility, nor is circumcision generally thought to enhance or detract from sexual pleasure for men or their partners. "
http://blogs.scientificamerican.com/...-male-infants/
http://pediatrics.aappublications.or....full.pdf+html
http://www.webmd.com/sexual-conditio...e/circumcision
http://www.circinfo.com/benefits/bmc.html
Well would you look at all these links! Guess circumcision does bring a benefit that you wouldn't get by "just washing".
We were born with quite a few stuff that aren't so useful to modern humans to be honest.
http://www.bloggingwv.com/20-useless...-we-need-them/
The wisdom teeth are one of the issues with which many of has had to deal with for example.