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Things don't need to be deities to be worshipped. Ever hear of cargo cults?
Kaiju are terrifyingly large and destructive creatures, so I'd think any primitive or even advanced culture that lives in or around their influence might begin to worhsip them, out of fear more than anything. Think of the tribes on Skull Island in the Kong movies. They'd do seemingly terrifying things to try to pay tribute to and appease the Kaiju out of fear that the Kaiju will come and wreck their lives. But, most likely, the kaiju aren't even aware of or care for their cults.
Considering where the kaiju live on Golarion, I'd say lizardfolk, grippli, and catfolk.
It has powers nigh incomprehensible, shakes the earth when it deigns to move, is basically immortal, and could destroy the average person with no effort at all.
Am I speaking of Gods or kaiju?
People will generally worship anything that helps them, or at least make sacrifices in order to get a powerful being not to harm them. In the various modules and adventure paths, there have been cults that worship everything from dragons, to daemons, to their ancestors, to giant oozes, to ancient machinery from space.
Almost any primitive or rural society could worship a kaiju, and even an urban 'civilized' society might revere the hulking magical god-beast that roams the countryside.
Yqatuba wrote:A better question is will they actually get spells and the like if they are clerics?
If it has the mythic ability Divine Source, then yes. They absolutely get spells. Otherwise, by RAW no. But the DM could certainly rule that they do.
They might also worship it as an avatar of an actual god like Rovagog - it need not be a literal avatar or in any way connected with the god, but gods can grant spells to worshipers of concepts that please it (such as a huge, devouring monster in this case).
At least the mystery god behind the strange cult seemingly dedicated to something else shows up in various Golarion source books and adventures.