And you know other religions weren't how exactly?
In a few hundred years we'll be calling scientology a religion, because it'll get enough power to influence goverments and the public. Like any other religion.
Scientology is a cult, but take away the extreme controlling nature of it and it's exactly the same as other religions. People are brought up being programmed, and give money to the church (it might not be the thousands, but if 100,000 x more people are in the church, then they only need to give a few pence a week and they'll be raking in millions)
Just look at picture of The Vatican...where exactly do you think that money has come from? That's right, Roman Catholic mugs.