So, does the WHO recommend the routine circumcision of newborns?
The WHO are not speaking out against the practice either and advocate circumcision of adults as one aspect of their approach to controlling the spread of HIV in heterosexuals. So it appears the harm caused by circumcision is an acceptable level of harm if it prevents a greater harm.
The issue therefore seems to be about consent rather than whether circumcision causing an unacceptable level of harm to the patient.
Also, provided it is done correctly by a trained person the WHO's position is that the level of harm can be tolerated better with lower risks in an infant compared to as a teenager or adult - hence it becomes the parents' decision as to whether it is a procedure that should be undertaken as an infant when there are minimal risks, compared to leaving it up to a potentially sexually-active teenager to consent when the pain and risk of infection is greater and the healing process is longer.
As stated previously, there are various cultural religious practices that also had some basis in medical experience/ knowledge at the time they started being practised. And tying circumcision with religious cultural practice would ensure a reason for the practice to continue. If people found mental / physical health benefits from prayer and meditation or fasting they would tie those practices into religion/ culture to try to spread the practice of it. Same with circumcision.
When there is expert consensus that circumcision does not control the spread of HIV in heterosexuals or when there is easy availability of anti-HIV and STD drugs throughout the world a lot of communities will no doubt think the cost/ risks of circumcision outweighs the benefit and the cultural practice will probably greatly reduce.