If both interlocutors are sufficiently pious, you can debate productively.
The successful side doesn't win, they're merely passing a message along. The side that must change isn't losing, they're being allowed the opportunity to submit more elaborately to heavenly wisdom.
There is a correct arrangement of the rules of debate, and that's when they're holy: when the rules uphold the sacred against the profane. You can't revoke the GIGO rule, but as long as one side has something worth saying, there is an arrangement of rules that upholds truth against falsehood.
The holy ruleset is not cheap. It's a lot of work, including a heavy time investment. I know the rules, but not well enough that I can write them down unprompted.