ok, I was brought up as a Catholic (don't practice) dh C OF E.
ds1 we had christened in c of e, without any problems.. vicar at the time knew we didn't go to church but understood our plans have always been to bring him up with knowledge of christianity, will go to church with him when he is old enough to attend sunday school.
ds2, since moved, so we phoned the local c of e church who refused to christen ds2 unless we went to church for a few mths beforehand so the congregation could get to know us. This was not possible as dh away a lot and I was bfeeding at the time and felt a bit uneasy about taking 2 children to church esp as ds2 was sooo noisy a feeder.
Anyway, my dad then came forward with a suggestion. He is now a RC Deacon and offered to baptise ds2 but in a catholic church.
dh and I pondered as we didn't want to promise to bring him up catholic or have to promise to convert, but my dad said most of the christian faiths recognise each others baptisms these days and he sent us a copy of the service he would use (as we also had non religious godparents, well they varied in beliefs) The RC church like one gparent to be catholic (which neatly one is, though doesn't go to Church)
In the end we had a christening that was as non denominational as we could get it.. yes the word catholic was in there once, I can't remember the sentence, but we felt we were not lying when we gave the response, and we ended up having a really nice occassion.
My Dad (who is very religious) amazed us by his openess to baptizing our son and the priest who allowed us to borrow his Church was also very open minded and welcoming, so for us it worked..
btw seashell - Can't believe I am defending them, but the Catholic church has never gone with the idea of limbo.. it's those theologians who put fwd the theory... the Pope finally dismissed it, it was never their policy (something most people don't realise and assume was their belief!!)