Circumcision is effective in limiting HIV transmission.
We now have confirmation — from large, carefully controlled, randomized clinical trials —showing definitively that medically performed circumcision can significantly lower the risk of adult males contracting HIV through heterosexual intercourse," said Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Disease. "While the initial benefit will be fewer HIV infections in men, ultimately adult male circumcision could lead to fewer infections in women in those areas of the world where HIV is spread primarily through heterosexual intercourse."
Apparently, the positive impact of circumcision is fairly substantial:
(Source)
The study was conducted in Uganda by Johns Hopkins researchers, and apparently was very well controlled.March 29, 2007 -- Circumcised men are up to 60% less likely to get HIV, and now the World Health Organization and the UNAIDS program recommend adult surgery to slow the AIDS pandemic. The recommendation comes only weeks after the WHO and UNAIDS officials asked an expert panel for advice. The advice is based on three clinical trials suggesting that circumcised men are 50% to 60% less likely than uncircumcised men to get HIV during heterosexual sex.
So, if you think AIDS will still be a problem when your child is sexually active-- this info is certainly worth considering.
Sometimes the cultural/religious practices adopted over many centuries are just superstitions and have no relevancy in the modern world. OTOH, sometimes they remain relevant.