@engineer,
There are disputes about the role of Islam in the German state and society, especially made by conservatives.
Generally, it was thought that Muslims here don't really intregrate.
The extreme right is often rallying against Muslims, especially when new mosques are being constructed, with -mostly- very hostile reactions.
I should think that this study should change some government politics (more those of practical-pragmatic kind).
But the federal interior minister is a conservative hardliner ...