Just to throw a spanner in - how will your (generic - not a specific question for anyone) child learn about religion to be able to choose later?

I went to a public school and have one baptised old Anglican parent and one non baptised parent. We did not go to church as a family regularly (weddings and funerals) but there was a belief in God and free discussion about any belief system. I was baptised Presbyterian, went to Methodist Sunday school and attended Catholic mass with my aunt when she visited. I was sent to scripture during primary school. As an adult I lean towards the Catholic faith (despite not agreeing with some of their teachings) but also embrace the principles of Buddhism. My DH is Catholic, went to Catholic school and is not practising.

I chose my religious leanings as an adult due to the broad exposure of religion I experienced as a child. Our children will probably go to a Catholic school but at home I intend to teach about all religions to encourage tolerance and also to give them the tools to choose their own faith when they want to.

I guess you need to be comfortable about whether you believe in God and if so, are you happy to have the discussion with your child about why you choose to believe but not practice (as Nickel said) or what your beliefs are. Most Catholic / religious schools do have a number of places that are open to non-Catholics if that makes it easier