I find that opinions matter in proportion to the opinion-holder’s willingness to do the heavy lifting of providing more suitable solutions.
If it bothers you so much, then get your fellow irreligious to acquire and make available a suitable, non-sectarian space. If on the other you just want to grouse and ask other people to solve your problems: well, be prepared to wait a long time.
Within the voting precinct, though? Because in suburbs with “exclusive” zoning* I’m sure there’s a fair number of precincts with no public buildings and the only non-dwelling within the boundaries happens to be a church. Yes, schools are in residential zones, but if the schools are relatively centralized – not uncommon in some “what, walk to school?” suburbs – you could still have a precinct without a public school in it even though the precinct is ipso facto within some particular school’s catchment.
*Probably not the best term, and certainly not the official one, but the first one that came to mind, segregated, is even worse. 
What I mean is large tracts of purely residential uses with no commerical or institutional uses mixed in. As opposed to cities on the one hand, and small towns on the other, where commercial/institutional and residential uses are in close proximity.
My sister used to vote in the sanctuary of a conservative Christian church that had a bigass cross hanging over the voting tables. It bothered her a little.
Seconding the motion!
Several years ago, the county used to rent my Taekwondo school for elections.
Basic general guidelines: they are looking for large floor space, good parking and as close to the center of the precinct as they can get.
Apparently, there is at least one mosque (or mosque-related building) being used as a polling site, in Dublin, Ohio. Dublin’s elections website. (See voting site 2H in the middle of the list.)
And apparently, judging by the results when you google the generic and should-be-inoffensive “polling place in a mosque” the wingnuts are indeed exploding as predicted. :rolleyes: at them, 
at the accurate prediction.
That’s it! I knew there was a term; all I could come up with was exorcism.
Most years, this one included, my polling place is at the local middle school. But one year it was at a Buddhist Temple!
I don’t think the Catholic church would have much of a problem with a deconsecrated church becoming a pub. A few years ago I went to a Christmas party hosted by our local priest. He offered me a drink and I asked what he had. His reply? “This is a Catholic rectory! We’ve got everything!” He did. too.
From my “Forgotten English” page-a-day desk calendar: “In Chicago and elsewhere in the late 1800s, alcohol consumption was often encouraged on Election Day, and many saloons served as polling places.”
When I was going to school at the University of Wisconsin, one of the most popular near-campus bars was The Church Key, which was built in a de-consecrated old church. I once fell down the stairs leading down from the old choir loft (yes, I may well have been overserved).
(A quick Google search indicates that it’s still in business.)
We have a lot of churches in this town, and just one place for Muslims to worship. they don’t call it a mosque, but “The Islamic Center” I need to find out now if it was a polling place this election, I’ve never been in it but I’ve driven by and it looks big enough to handle it.
My polling place used to be in a church, but this very election it was changed to a building at the local fairgrounds.
It’s not proscribed in the Quran. I hope you pray for your brother in law’s soul anyway.