Too late to the debate to read the whole thread and probably done already but I will throw in my 2 cents anyway to follow the end of the debate
There are claims medically circumcision protects against infections (at least I was told by a Muslim friend anyhow)
FGM can stop a woman from having sex or enjoying sex, cause problems in childbirth, it's not the equal imo to circumcision as it can have devastating lifelong effects physically and psychologically whereas usually circumcision isn't remembered and in terms of how things work it doesn't make any impact on ability to have or enjoy sex
I don't think with the % population of Abrahamic faith believers we have in the UK it would ever be practical to make it illegal... it would still happen, at least let it stay legal that it can be done safely and people don't avoid seeking treatment if there ever are complications