Religion is the single most powerful destructive weapon when used against the human mind's ability to think critically. It conditions young forming minds to accept "truth" from an authority figure no matter how little support that "truth" has in the material world. It conditions you to believe the words of people who can then get you to believe one unbelievable thing after another...you know...idiotic things like that "terrorists want to kill you because they don't like your freedom!" Do you really believe that nonsense? Have you ever actually heard anyone on this planet threaten any American because they opposed our freedom? How many of you believe that? Why? I will tell you why...it is because one of your trusted authorities (TV news person, politician, clergy), told you to believe it...and your religiously broken critical thinking process did not kick in and make you ask for verifications or simply see that idiocy for what it is...unverified, illogical, unsubstantiated, childish idiocy!
In some dictionaries you may find that the stated difference between popular religions and cults is that popular religions are exempt from the definition. There are even definitions that state that the only difference between cults and religions is that if a large number of people believe in something it is accepted as a religion.
The only key difference between cults and religions is that religions are "accepted" by significant portions of the population.