How do we know what Minoan religion was like? By looking... literally... at the artifacts they left behind.
We can't read what the Minoans wrote in their own language using the Linear A script. And the early form of Greek that the Mycenaeans wrote using the Linear B script amounts to little more than bookkeeping records from the Mycenaean occupation of Crete in the century or two before the Minoan cities were finally destroyed.
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