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That 'form' of religion is a figurative sense.  In other words, an interest, a belief, or an activity that is very important to a person or group is metaphorically like a religion.  It doesn't mean that passionate interests literally are religions.

No, no I get the definition and I get that it a metaphor... I also get that it is still apart of the definition of the word religion, as it describes the works and dedication absent deity worship. Which again is compared to those who do worship a deity, but minus the deity which makes it a "Form of religion." (works and dedication minus the god)

Or do I need also define the word form??

So why not simply dispense with the metaphor and use plain English, such as "work" or "dedication"? Of course, that's a rhetorical question. Doing so would deprive you of the false equivalency you perversely thrive upon.