Words spoken in different languages are not ‘kufr’ but it is the false actions/beliefs that go with them that are.
Salaat is the continuous process of learning what Allah wants us to do and then implementing this; namaz has become the opium of the-
“2:18 Deaf, dumb and blind of reason! They will not return to journey in the right direction (unless they use their perceptual and conceptual faculties.”
If namaz meant Salat then there would be no problem, but unfortunately it has more to do with ‘pooja’!