These are different questions, Technodad.
The judge's decision explicitly excluded questions of truth: it was a 'if it wags its tail and barks then it is more likely than not a dog' kind of judgement. The judge concluded that Scientology looks and behaves like a religion, and so should have the right (which it, as an organisation, had not sought by the way the case was brought by individuals) to conduct weddings in its 'chapel'. But this judgement does not conclude that any moral benefit derives from this Scientology does not have charitable status, as other religious groupings do.
Whether Scientology is a religion as it would generally be understood is debatable (the judge's decision was in some respects an odd one, because his definition of what a religion is could be contested in so many ways). Certainly it is anti-theistic, and values rationality and science (the clue is in the name). The claim to be called a religion was bitterly contested within the organisation itself.
Do I think it is a con? As far as I know, becoming a Christian is entirely free of charge, and any donations you make are entirely voluntary. There is no such thing as paying in order to access higher levels of the organisation. There is no hidden knowledge, no secrets that one must be a member of the inner circle to learn -- on the contrary Christians are happy to tell anyone all about their faith (a fact that many people find objectionable, but it shows Christianity doesn't do occult secrets). And the bottom line for me is that Christianity is true, and Scientology is a load of hokey.
However, I don't much care whether they can celebrate weddings on their premises.