They mentioned a possible Islamist motive. Which is an important distinction to make because the Westboro Baptist Church doing something is not the same as some random Christian doing something.

Also, you're reading France24. Sticking with state media, but this time German, DW has more:

Investigators earlier said the suspect was an Afghan citizen who had been resident in Germany for around a decade. He had no criminal record and had not come to law enforcement's attention in the past, they said.

The suspect was eventually shot by police. As of Saturday evening, he was alive but in the hospital and in no fit state to be interrogated, according to investigators. As a result, they said, his motives and the reason for his attack required further investigation.