There's a difference between believing circumcision should be legal, and believing circumcision is a form of basic religious freedom.
Supposing I belong to a faith that believes in in tattooing the young at age 5, is that a religious freedom? Assume, for instance, that we believe in tattooing the genital area of the young at age 5. This is an area that will not be observed by strangers. Should it be legal, then, to tattoo a swastika symbol on the pubic area of your offspring at a young age (after all, it's somewhat unlikely this will hurt your offspring's future employment prospects)? If not, why?