Do you believe in all Gods?

A question for theists only and I guess the answers may vary.

Do you believe in the existence of ALL Gods if you're theist but just worship your chosen one? Or do you believe only one God exists?

I was just wondering. Thank you for your answers.
Update: EDIT: A question for believers only. I'm not interested in "they are all fake". I'm interested in the thoughts of religious people and how they view other Gods outside their religion. So please, "they are all fake" isn't helping me. I know.
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