From deutsche welle:

While right-wing terrorism is currently the focus of attention in Germany, the threat posed by religiously motivated extremism remains. Radical Salafists are considered especially dangerous.

“We have to understand that Islam is a religion of action, a religion of deeds. Each of us should know that paradise is the goal. So don’t waste any time on your way to getting there.” That is the message of Mohamed Mahmoud, a radical and previously convicted Islam convert active in Germany.

His message is aimed at the Salafist community in Germany, a movement emphasizing the earliest Muslims as model examples of Islamic practice – rejecting any modern changes to Muslim teachings. Salafists are the fastest growing group of Muslims in Germany, ranging from pious believers to radical followers.