Just for the hell of it, here's my silly pitch: hide the monsters much more, and give them more of a "Biblical" flavor, so it isn't actually clear which side in the store is right. In the end, our hero tries to convince himself to shoot his own son, but at the last second he can't do it. Then the roof is ripped off the car, and the son is pulled into the air, where he is transformed into a horrifying, deformed Angel-thing before our hero's eyes. Turns out the "religious nuts" were right, and the hero's hardheaded appeal to a materialistic version of rationality is blown to bits. It's the End Times Rapture bay-bee, but it's completely horrifying and a fate worse than death. Cut to credits.