1. a particular system of religious worship, esp. with reference to its rites and ceremonies.

2. an instance of great veneration of a person, ideal, or thing, esp. as manifested by a body of admirers: the physical fitness cult.

3. the object of such devotion.

4. a group or sect bound together by veneration of the same thing, person, ideal, etc.

5. Sociology. a group having a sacred ideology and a set of rites centering around their sacred symbols.

6. a religion or sect considered to be false, unorthodox, or extremist, with members often living outside of conventional society under the direction of a charismatic leader.

7. the members of such a religion or sect.

8. any system for treating human sickness that originated by a person usually claiming to have sole insight into the nature of disease, and that employs methods regarded as unorthodox or unscientific.

Since Scientology is a scam, no... since a scam cannot be a cult either.