Scientologists believe they are spiritual beings. Some believe they have been around for a long, long time. Some believe that this universe is a massive infinite space and that there is life on other planets. So it could be said that some Scientologists believe in "aliens", meaning life on other planets.

Now, I have never seen any writings about (or a Scientologist admit) the belief that an alien lives inside them or that there is a spaceship buried somewhere waiting to take all Scientologists away.

There is no worshipping of aliens found in Scientology scriptures. Nor does worshipping take place informally.

It is a common misconception that Scientology is based on alien beliefs or ancient aliens or something of that nature. Scientology is based on communication, knowledge and understanding.

I think the whole alien thing comes from the next question.