There's a difference between Scientology itself, which can be described as a movement, and the Church of Scientology. But although the Church of Scientology seems to be a religion because of the word church, it is in fact a trademark of an organization.
Scientology itself is a movement with religious characteristics, but also characteristics of a cult. Whether or not Scientology is a religion is debatable, but in my country, it's not a religion as defined by our law, and the same goes for the UK.
I think it is considered a religion in the US, though I'm not sure.
I consider Scientology to be a mindfuck; that doesn't make it non-religious, of course. But I consider it to be a non-religious mindfuck because I define religion based on cultural tradition. So, a religion needs some historical background that's bigger than a failed science fiction writer in the 50s.
Edit: Besides, they claim to be an empirical science. Not THAT religious in my book.