[JibJabLab]

That might be difficult as many churches are polling stations and they'd have services on that day. They could effectively be closed for 4-7 hrs that day. For many, their service would trump any political duties you might feel they are owed.

[lexs]

move the polling station then?

[the_watcher]

It's already a struggle to find enough polling stations that are large enough in some places.

[Macha]

Sunday does free up another set of large buildings that are often even government owned - schools.

A lot of polling stations in Europe are schools for that reason.