What is the ruling on one whose methodology contains a slight deviation in speech, even though his creed is correct?

Question:
What is the ruling if some of the callers to Allah have a correct creed, but in their methodology there is a slight deviation in speech only? Are they considered among the people of innovation, and do we attribute to them the methodology of the Khawarij?

Answer:
If he holds the methodology of the Khawarij, he is a Khariji. The one who holds the methodology of the Khawarij and says their methodology is correct is considered one of them. So he must repent to Allah (Mighty and Majestic). Because the methodology of the Khawarij is an invalid methodology. It is not permissible to praise it or commend it, or to believe that it is correct. It is contrary to the methodology of the people of the Sunnah and the community. Yes.