- its dogma,
its priestly class of interpreters,
its religious texts,
its faith in the unseen/unproven,
its "faith" in general, as a way to give the souls of believers an orientation
its Holy Trinity,
its required sacrifices,
its worldly preoccupations,
its public testimonies, affirmations of faith amongst followers
its religiously-inspired dietary prohibitions
its rituals and practices,
its witch-hunt's, crusades, and jihad's.
its messiah(s)
its presumptions about human nature on which all of its affirmations rest
its holy garb
its holidays
its churches
its patron saints
its religious martyrs,
its holy sites that one must pilgrimage to,
its notions of the afterlife,
its retort to doubt,
its solutions to rectify justice
You don't need a God for something to be a religion. Religion is a human condition, imprinted into our genetics. Expressing ourselves in a religious manner, and having faith, gives our soul an orientation, and makes life meaningful.
You can find all of the above in Leftism, and you are more then free to challenge me on any one of those, and I'll be more then happy to supply you with examples. No one denies that Marxism was a political religion... when Stalin saw that communism wasn't a workable model, out came the end-day proclamations, of how the proletariat in Soviet Russia, would unite with the proletariat in Cleveland, and the Proletariat in Buenos Ares, and the Proletariat in Paris, and together, they'll unite, to deal the last deathly blow, to the beast that is known as capitalism. Faith in Communism's ability to function was forced upon people.
And as I've said in a previous response, which I don't think you have the courage to address, is that any time 2 or more individuals come together to start a movement, that will be an end in and of itself, you have the very real possibilities of living out religious pre-requisites, if not becoming an outright religion entirely.