I'm not sure if you are thinking of a catholic school but if you are not a practicing catholic (ie attend church within the schools local parish at least a few times a year) and if your child is not baptized you would have great difficulty getting them accepted anyway. I can't speak for every religious school obviously but this is my experience enrolling my DD in the local catholic primary. FWIW it's more my husband who wants the catholic education for our DD. I had 12 years of catholic education and have made an educated decision it's not for me. However I am willing to give my DD the chance to learn about religion and then she can make up her own mind.