What is the Islamic view on people who use religion and religious appearance as a tool to gain popularity and personal profit?

Summary

This Bayan states that religion must not be used as a mask for popularity, influence or personal gain, since Allah forbids trading His verses for a petty price. Teaching accreditation issued by religious authorities serves to ensure that only knowledgeable and trustworthy individuals teach religion, which helps curb deviant teachings. Using religious attire to deceive the public is regarded as symbolic fraud. Muslims, especially influential figures, are advised to avoid situations that invite suspicion.

Written in our own words from the original fatwa — check the source before acting on it.