I think settings is working very hard to write down more history of the gods in book form.
Either way, I'll repeat myself.
Talad created the Kran. He used energy from the Azure Sun to do so, just like we use fire to cook our food. Then who do we praise for the good food? The cook or the fire?
Shorty, Talad and Laanx did not create everything but the Crystal created nothing, it only serves as a source of energy.

Yliakum's society is advanced enough to know what the Crystal is and it has real gods that are much more suited for worship. In that context it doesn't make sense to worship an inanimate object like a bunch of ignorant cavepeople.