A lot of the responses seem to assume that, like it’s a ‘free presentation with gift’ by somebody selling time share condo’s and they basically aren’t going to let you out of the room till you buy one.
But that’s speculative, highly unlikely IME of ‘church’, which is pretty much strictly Catholic. I’m as ignorant as a lot of atheists are about what really goes on at Protestant churches but at least I admit I am, rather than making stuff up or basing it on fictional TV or movies from my subconscious. 
When there’s a movie night at our parish, they just show a movie, some regular G/PG type movie; sometimes they show a particular classic movie in which the church building appears, sometimes it might have a religious theme but some well known flick where everyone knows that.
There is in fairness an ‘agenda’ in the non-negative sense, of showing a friendly community: perhaps people might at some point think further about joining (or rejoining) it. But somebody getting up and telling non-believers they are going to hell…probability zero. I have to think in the vast majority of cases the same would apply for a Protestant church’s movie night, even the ‘evangelical’ kind, and can’t see it as reasonable to just assume it would be some high pressure sales pitch.
But part of Christian belief is to spread the Word, though with differences in method and emphasis (and always accounting for the particularly vast differences in what Protestants believe AFAICT, which seems can down almost to what any particular person wants to believe that they say is based on Christianity, but fine with me). I don’t see how that can be directly compared to people who don’t believe anything, where by definition there’s no directive within the non-existent belief to do anything about it.
I used to work with a guy who actually brought literature to work that was not only pro-Protestant but explicitly anti-Catholic, not a bad guy, just had it there, I leafed through a few from curiosity, the big deal is what exactly? So hard to see, just from my POV, somebody really justified in getting bent out of shape about a flyer for a church movie night. But we live now in a very touchy society, and I personally would not hand out movie night flyers from my home.