Without mentioning any names (cos I’m a chicken shit and Mrs-O would kill me if I got a nasty-o-gram) why would an organisation, officially recognised as a religion or not in the UK behave in an aggresive way?
The whole point of such organisations, benign or otherwise is to increase membership. Whether that is to spread ‘the word’ and save all the unfortunate souls or to accumulate wealth for the people at the top, litigation is the wrong route to take and self-defeating.
Sueing people or organisations for the slightest er, slight is just going to make it look aggressive, a bully, insecure and have alterier motives that it wants to hide.
Which is probably why the ‘religion’ isn’t officially recognised as a religion.