Christians have a far more complex representation of good and evil, the one which spawned the natural rights which we use as a precursor to modern secular moralities today.

Classical mythology, before it was assimilated, was certainly an early part of the process of religious development. But we aren't living in their aeon anymore, we've taken their ideas (and those of the egyptians) and have evolved... Now, like it or not, you are living in the aeon of christ and you speak his language.

Rationality was absolutely not embraced as the highest value in the ancient states. The city state of athens was briefly prosperous, but most weren't... and again, you're missing the fact that these people worshipped precursor gods to the god of abraham. It's all a connected process that's culminated in the christian world.

I'm not saying it's impossible to have some form of scientific curiosity without the god of abraham (although to be fair, in most city states people would be killed for such corruption). I'm saying it was incredibly limited in scope, and possessed by a different spirit.

Christian rationality is full throttle by design by it's own set of virtues, because of it's moral fixation with truth and that all that was missing in the world was a lack of good. This spirit defines the aeon we live in.