How then would you determine who is an active Christian and who isn’t?
It would surely require some violation of human freedom to find out. And for the sake of who or what? Monetary profits?
Approving holidays on the basis of your belief and activity, purely for the sake of the country’s economy, would mean a society in which the love of monetary profits is put before the unity of a nation resting and reflecting together.
Can you imagine if Anzac Day was only approved to those who went to the dawn services or the marches or only for those who were related to an Anzac?
We’d either have a very divided country or a very fake one.