Religion should only be practiced by consenting adults.
Why does this idea matter?
I do not think it would be a good thing to stop people choosing to believe whatever they like but a large number of these organisation think it is a good thing to spread their delusion to others. Whilst most adults can treat scientologists, evangelicals and jehova's wirnesses with approporiate distain children who have not yet developed critical thinking capacity can be influenced by these cults.
I think it's time to put cranky ciults in their place.