Why Don't Europeans Vote away their National Churches?

I've noticed that the better European countries are majority atheist, yet still have state churches.

Why haven't they been voted away?

Is it just because they provide a nice setting for weddings and funerals?

Is it because they have halls to rent for other activities?

Is it because so many historic buildings are churches that it is just easier to keep them than to set up a separate bureaucracy to maintain them?

I don't know what is more frustrating, seeing America going backwards or seeing Europe getting just up to the line and not finishing the job.