My opponent opened with a conclusion and then... hasn't really argued it yet. "Many reasons" is a promissory note, not a case. And that's actually revealing on a structural level: the argument almost always arrives as a list of specific verses or specific abuses, none of which establish the sweeping claim that an entire tradition is morally unacceptable.
Here's the thing, though. Even if every item on that list were true, the inference still wouldn't hold. Someone could list real atrocities committed by Christians or Hindus or secular states, and nobody would conclude those categories should be treated as abnormal. If your standard only gets applied to one community, it's not a moral standard, it's a target.
And the systemic cost matters more than any single verse. Treating a billion people as a suspect class doesn't purify a society, it hardens the worst voices inside it and silences the reformists. So far, the other side has asserted a verdict and skipped the part that matters: why this verdict generalizes.