Anybody know why sunni muslim called shia muslim polytheist?

i dont care if wrongly, but what did they refer to? thanks.

like islam wrongly called Christianity polytheism , due to the trinity, wrongly because the "trinity is one" in the ancient creed statement, but they refer to it poly because "3 personality" plural. similar i ask what they refer to in shia islam?

Anybody know why sunni muslim called shia muslim polytheist?
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