I think your OH needs to either:
- go to church, practise his religion and be a Catholic
Or,
- shut the f up!
I had a ten year relationship with a "catholic" man. He wasn't a good Catholic boy - he rarely went to church just for his nieces and nephews holy communions, weddings, funerals, Christmas and Easter - that's it. In ten years I went to church with him around 5 times which shows how often he attended.
When things were good between us (not often as he was an alcoholic and abusive but that's a whole other issue) we did talk about kids. One of the many reasons that put me off from having children with him was that he said he felt strongly that they should be brought up Catholic, go to Catholic school etc. I felt it was wrong and hypocritical to even get married in a church if we didn't attend (we never married), let alone bringing up children in a faith that their mother didn't believe in and their father no longer participated in (he only went when it was important to his mother - for her not for him). I feel it's a mockery - whilst I don't believe in organised religion myself, I have enough respect for those who do not to pretend I believe something that I don't just for my own ends.
If you feel strongly that it's not right for your LO then put your foot down.
As others have suggested, also, if he won't budge on it then tell him he must organize it and pay for it himself. Unless he loves doing thiat sort of thing, he'll freak out and inertia will kick in!
But, try to get him to understand your point of view first (before "tricking" him). I'm not yet a mum (23 weeks into first pg) but from what I understand, parenting is about pulling together and putting up a United front. Compromise if you feel you can - maybe the baby could be baptised but not go to Catholic school? If it's completely unacceptable to you (as the thought was for me) then stick to your guns. There is no right and wrong here, just what you feel comfortable with.
Good luck, and congratulations on your pregnancy! 