I've always wondered why many other countries shut down for Christmas entirely yet have relatively low or no compulsory religious language in public institution

I've always wondered why many other countries shut down for Christmas entirely yet have relatively low or no compulsory religious language in public institutions, or purity tests in politics and government. It might be too easy to blame capitalism for a moral decline in the general public, were it not unpatriotic and therefore not aligned with the political party that most religious people tend to associate with.