The only difference between Scientology and any other faith is the time-line involved.
Because Scientology was invented within the living memory of a lot of its practictioners, it is seen as fanciful nonsense, but in fact, that's precisely the same set-up as Christianity, give or take a couple of millenia.
So, pop back in 2214 and you will probably find that Mr Hubbard is as revered and believed as Mathew Mark Luke and John.
Don't forget the important difference - if it's a religion, you 'believe', if it's a cult, you 'dabble'.