My 2 DC (4 yrs & 2yrs) have been baptised as Catholics, as it is my DH's faith.
I am an ardent aetheist, however I agreed to have our DC baptised because it was so important to my DH.
As a result of this week's revelations concerning the Catholic Church's activities in Ireland (which tbh was common knowledge by many people, including myself - however even I had no idea of the extent and complicity of the church authorities) I no longer want my DC associated with this organisation. My DH (with sadness) agrees.
So how does one go about renouncing their faith? Given my DC's tender ages, it is probably inaccurate to describe it as faith - it is more a case of membership of the church.