Is it true that the creed of many Muslim scholars who are not specialized in the disciplines of Sharia is invalid?

General judgments should not be made about doctors, engineers, and others, for among them are many people of rectitude and righteousness. Many of them hold leading positions in Islamic work and in calling people to Allah, while also acquiring religious knowledge and adhering to the straight methodology. It is possible that some of them may not know the details of the correct creed, or may have a deviation in their creed. This can also be found among those affiliated with the Islamic sciences. It is not the Muslim's task to issue such judgments.