It’s very fascinating to me, because on the one hand they made sacrifices to the gods, but on the other hand a lot of the myths about the gods that we know about were credited to poets like Homer. How could these stories have been written by poets but then accepted as real events?
More can always be said on the matter, as no answer is ever 'final'; further answers are more than welcome from anyone able to contribute. For the meantime, OP, you may be interested in the following previous answers. The first two cover how the Greeks regarded Mount Olympus, and offer a view into how they thought; the third is a more general treatment of Greek belief.