I don't understand why those that don't go to church have their children baptised and I don't understand why anyone would ask a non-Christian to be a God-parent and I don't understand why a non-Christian would want to be one.
I say this as a non-Christian who has had a lot to do with Christians and church over the years. Maybe I find it more significant an event than non-Christians who see it as one of those things that you do like getting married and having birthdays? Also, maybe a lot of non-Church goers kinda think they believe in God?