I've done it on multiple occasions for effect, performing the unforgivable sin works against some theists who want to believe they have a chance of converting you. Most of the time it doesn't make a difference, the theists keep on trying because they either don't know what's in their book or just don't care, but it can scare the small, stupid fish away.
There is nothing demonstrably true that religion can provide mankind that cannot be achieved as well or better through secular means.
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