baby drama😞

Hey guys first post..basically my man & I are eager to start a family of our own! I have a little one already & he has become a father figure to him as well. The only issue is my little one & I are both Catholic and my boy is due to go to school after summer. But my partner is a Protestant & is refusing for us to have a baby unless I agree the baby be either Protestant or an atheist. If I hadn't already had my son baptised and going off to a Catholic primary school then I would have no issue, my problem is he is happy for both kids to be in separate schools etc as well? I don't see that as an option for us as a school run is hard with one drop off never mind two separate schools. Don't know what to do & know he says we will just not have any more kids as he isn't raising a catholic even though he basically is at the moment. It's getting me really down as I'm so desperate to make our family larger. Any ideas?