Comment by akomtu

It's a religion of an overdeveloped mind that hides from everything it cannot understand. It's an anti-religion, in a sense, that puts your mind on the pedestal.

Note the common pattern in major religions: they tell you that thoughts and emotions obscure the light of intuition, like clouds obscure sunlight. Rationalism is the opposite: it denies the very idea of intuition, or anything above the sphere of thoughts, and tells to create as many thoughts as possible.

Rationalists deny anything spiritual, good or evil, because they don't have evidence to think otherwise. They remain in this state of neutral nihilism until someone bigger than them sneaks into their ranks and casually introduces them to evil with some undeniable evidence. Their minds quickly pass the denial-anger-acceptance stages and being faithful to their rationalist doctrine they update their beliefs with what they know. From that point they are a cult. That's the story of Scientology, which has too many many parallels with Rationalism.