I think maybe the confrontation happened, and that there were two men in a pickup. But I seriously doubt that they beat him up because they were Christians.
Most likely they were tailgaiting, he got a fit of road rage, they both pulled over, he stupidly got out of his car and started to berate them, and they beat him up.
I have occasionally been tailgated by pickups full of drunken rednecks over the course of a number of years, and usually I pull over and let them go by. I still remember one instance when a couple of kids flashed by and, because I didn't pull over quickly enough, the kid in the driver's seat opened his door--at around 80 MPH--leaned out on it, and mooned me. I was a bit afraid of an accident, but on consideration I thought it was pretty funny.
I suspect an angry guy was stupid enough to confront two angry guys, and got beat up for his pains. I doubt it had a thing to do with his anti-Christian views.
You may be right. I've seen a number of road rage incidents, as I'm sure we all have.