a religion. I have long been saying it, but so do others (see URLs below). Leftism is a stealth religion. Stealth because it masquerades as politics and doesn't manifest with the classical trappings of religion. Functionally, it is a faith.
One of the most influential men in history (IMHO the most influential) said, "Man shall not live by bread alone, but by every word that proceeds out of the mouth of God." Now, He wasn't just saying man's soul is programmed to need nourishment by the Truth in the same way man's body requires protein. His statement contains something even more significant: that man, both individually and collectively, if he does NOT choose the Truth to live on and by, will INELUCTABLY find some sort of junk food to gorge on. This happens because society has to function somehow, which is a spiritual, not a scientific issue.
Science can not tell us what is morally and ethically right and wrong, or what is spiritually dangerous (i.e. the whole occult realm), nor does it slake the soul's thirst. Science by its very nature can not handle matters pertaining to the soul or the spirit (cf. as a hilarious example, my posts about Google's inability to match images, and I think I've also mentioned the comical results that more often than not result when you use an A.I. translation system). It is limited in its purview to the material realm. Science trying to apply its tools to understanding the matters of the soul and spirit is about like trying to understand the future by reading entrails.
But since man"kind" long ago was hit by a Cosmic Trojan that caused massive mutations not only in his own soul, spirit, mind and body, but also in the universe itself, he malfunctions on multiple levels, meaning that he will consistently default to error (picture an invidious "Home Page" toolbar being covertly installed in your computer). He needs to constantly be reformatted to The Original O.S., or he comes up with various substitute junk O.S.'s.
Depending on how scientifically and technologically advanced any given society is, the junk O.S. might be quite sophisticated (compare, for example, Nazism or Bolshevism with something like the average headhunter tribe). In his mission to convert the whole world, the Leftist evinces the same passion for his creed as Torquemada. He's just as keen to bring his message of "salvation" to all the lost "reactionaries" out in the DogPatches of politicaldom as St. Paul was in spreading The Good News to the Gentiles (the difference of course being that Paul never used the slightest violence---persuasion and proclamation being rather his weapons of choice).
But don't take my word for it; read other people's insights on it (no, these are not religious articles, some even written by Jews):
"Leftism, the Religion"
"Leftism: a Radical Faith"
"Karl Marx As Religious Eschatologist"
"The Menace of The Religious Left"
"The World's Most Dynamic Religion Is..."
"Leftism As a Religion"
"The 7 Sacraments of Liberalism"
"Modern Leftism & Magical Thinking"
"New Inquisition"