Without exception all religions main goal (on paper at least) is a religious one. If they do charity outside of this it is extra as it is with witnesses, we are not unusual in this respect. And as an established people's right, religion is a recognised one. All people should have access to religion of their own choice!
I cannot see how you can simply say that any division of religion beyond this is driven by anything beyond personal opinion. likes and dislikes.
The only exception being if they break common laws.
The argument that religions are freeloaders is just the position from those that do not value religion and are religiously intolerant.
The only arguments I see are "all religions should pay tax" from those that are not religious and don't recognise it's value and "Witnesses should pay tax because I don't like them" from people with a grudge against witnesses. These are both arguments from a position of prejudice and not objective at all.