Yes. I also consider him to have been a cynical con artist, a drug addled lunatic, and a self-deluded fraud. It is very well documented that...
1. He started Scientology as a way of making money.
2. He was a recreational user of many psychiatric drugs when he wrote the upper levels of Scientology training.
3. He regularly claimed to have a mastery of nuclear physics, medicine, photography, maritime operation, and many other subjects while display no knowledge of them *AND* being documented as failing many of those subjects in college and military.
Hubbard may have been a religious leader, but I doubt he was very religious.
St. Petersburg Times
Ex-Scientologists across the world
So many more.