Money. Simple as that.
Scientology exploits uninteligent people with low self esteem.
Scientology has often been accused of using dirty tricks to attract people, and to keep them. It has in fact been outlawed in some countries. To learn more about Scientology, I suggest you start with the Wikipedia article, http://en.wikipedia.org/wiki/Scientology. There is also a more specific article on controversies here: http://en.wikipedia.org/wiki/Scientology_controversies
Scientology is Fake.
People are stupid
You have to take a class for Scientology.
Scientology is not a faith based religion. It is an applied religious philosophy. It offers tools that one can use in his own life. One is not asked to worship a God or Gods in Scientology. What God is, is up to each personal understanding. People from all faiths practice Scientology. You can be a Christian Scientologist or a Muslim Scientologist, it doesn't matter.
There are over 11'000 Scientology churches, missions and groups worldwide. To find the closest one to you, you can use the "Scientology church locator" on the Scientology website. That is a map that shows you the location of all Scientology churches and missions.
The Scandal of Scientology
Scientology was invented by the author Ron Hubbard.
The Scandal of Scientology was created in 1971.
Scientology cross was created in 1955.
Scientology is international. The Scientology religion has over 11,000 churches, missions and groups all over the world.