Well, am I psychic or what? Turns out this guy was (yea! for past tense) a muslim, pledging allegiance to ISIS and calling on other members of "the religion of peace" to kill those who don't share their particular collective delusion (oh, and he was on the "No Fly List" and still had guns, so we gotta fix that! Of course you'd think that anyone who burned down a school would be a "prohibited person" to begin with...):
Before his death, Amri pledged his allegiance to ISIS leader Abu Bakr al-Baghdadi and called for jihadists to take revenge on "crusaders" bombing Muslims, a video posted on Islamic State's Amaq news agency showed. It was not clear if the video was made before or after the Berlin attack.
Amri pledged his loyalty to ISIS in an undated video.
"My message to crusaders bombing Muslims everyday... Their blood will not go in vain," he said. "We are a nation behind them and will take revenge for them," he said.
"I call on my Muslim brothers everywhere... Those in Europe, kill the crusader pigs, each person to their own ability."