Whether you think terrain theory is true or false, it has clearly become a cult at this point for many of its adherents. They even call you a devil worshiper if you dare offer any skepticism to it.

Many are just as zealous as pro-vaxxers. Cults everywhere nowadays.

a cult

a) CULTIV (cultivated) - ATION (through action).

b) true vs false; agree vs disagree; pro-vax vs anti vax; god vs devil represents ones choice (reaction) to want vs not want the suggestions by others; hence cultivating them.

c) "a cult" represents kabbalistic phonetic for "occult" aka concealed from those who want suggested information. If I suggest something; and you consent to want it, then I gain the power to conceal it from you.