[quote=thewizardguy]
The writers of South Park? And also, Stein is an expert on killing Gods. He would simply see it as a challenge, and aspire to throw the entire dimension into chaos as he has already done to so many other realms.
[/quote]

They are the writers, he is in their story. He cannot touch it. All I'm gonna do is fix the damage done, after all, South Park will tear itself apart without its main cast.
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And as a god of chaos, Bob is not in a good fight right now. Only a god of Creation and order could possibly defeat him ((Primus in his original form)). Or a Prime.