Especially when such a deity, as described, is perfectly capable of making such a search totally unnecessary -- or at least impossible to fail.None of them are reasonable. It doesn't make sense to punish people that are trying to find guidance nor does it make sense to have people figure out which guidance is right to avoid God's punishment.
Instead of inventing such patently silly notions such as "God can only talk through special messengers," each and every one of whom was just another human.