
Neither of my kids were christened due to both myself and their father being totally agnostic. This didn't concern my side of the family at all, my folks had only had us christened because it was the expected thing to do 40yrs ago. However, my hubbys family were mortified. In the main this was because christening were just another excuse for a family p***-up and I had already provided them with enough free booze at the wedding thankyou very much! However, I will never forget my nan-in-law saying to me....
"but you have to have her christened, what if something happens to her, you won't be able to have a funeral"
To answer the question though, I think a lot of it these days is down to 2 things - older family members that are genuinely religious or believers [and you DONT have to attend a church to have faith btw] and doing it 'for them'. Or primary schools - many good ones are religious and are more likely to offer a place if the child is baptised into that faith. Finally of course, as I said earlier, although I am personally agnostic, I think a lot of people do still believe even if they dont attend church and when the curtains open on life or close on it, they fall back on their faith. Just my opinion, but its how I see it.