Of course, not all "isms" are dangerous. For example, "Theism" is a good "ism." However, it seems that for every good "ism" in circulation there are a hundred dangerous "isms" floating around.
Centuries ago, the apostle Paul exhorted the Colossians, "Beware lest any man spoil you through philosophy and vain deceit, after the tradition of men, after the rudiments of the world, and not after Christ"(Col. 2:8).
It would be foolhardy to believe that our generation is somehow immune to the presence and spiritual danger of men of cunning craftiness who lie in wait to deceive. Times may have changed, but the need for vigilance against the dangers posed by false doctrine has not changed! We still need to "try the teachers whether they be of God because many false prophets have gone out into the world" (1 John 4:1).