The Scientology site has a section to answer questions on the subject. It's the Scientology FAQ.
There are a lot of "opinions" about Scientology from people who, frankly, know nothing about it. (we all know people who are experts-in-their-own-mind on many subjects).
One the other hand, if you really want to find out about something, the sensible thing is to go to the primary source. In this case, to find out about Scientology, check out the Scientology FAQ.
Since the forming of the first Church of Scientology in 1954, the religion has grown to span the globe. Today, more than 8,500 Scientology Churches, missions, related organizations and affiliated groups minister to millions in 165 countries. And those numbers are constantly growing; in fact, Scientology’s presence in the world is growing faster now than at any time in its history.
As the only major worldwide religious movement to emerge in the twentieth century, Scientology generates immense public interest.>>
Scientology Video: Why we help