These books are intended for Muslim students, not traditionally Christian ethnic Finns, that said, the only reason why Muslims are being allowed their own religious teachers is due to the pressure they exert on public officials. We do not see buddhists, Hindus, Tao or even Russian Orthodox and Catholics being allowed their own religious instruction, just Islam. KGS
NOTE: Soon you’ll be reading about the Shiites in Finland demanding their own books and teachers (and getting it) as well.
H/T: Holger Danske