Sea Breeze: why is logic across cultures, languages and time periods always the same if it is a human construct as you say?
It seems to me that you answered your own question. It's like asking "why is spoken language always done with the mouth, if it is a human construct?" Logic is a method of reasoning, and reasoning is a way that we interpret our world. Logic just applies a stricter set of rules to make our reasoning more reliable. It's a natural outcome of humans applying their thinking capabilities. It should always be the same, every time it is developed.
Please explain how an intellect would have "designed logic." Help me make sense of this claim, seeing as you consider it an important basis for determining if a god exists. Try to avoid "how else" statements. You must have a clear explanation for how this is done, right?