What specific evidence would people require to believe in God's existence?

Greatest I am It is strange that you seem to assume that recognition is somehow a given based on your definition of 'Perfection of systems' when there is no such system in nature.That is of course unless you wish to define perfection in your own way to suit your contentions. And this means what? A direct line via bell telephone? Ham radio? ESP?

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"The world is so exquisite, with so much love and moral depth, that there is no reason to deceive ourselves with pretty stories for which there's little good evidence. Far better, it seems to me, in our vulnerability, is to look Death in the eye and to be grateful every day for the brief but magnificent opportunity that life provides." - Carl Sagan, Billions and Billions

Greatest I am You have already mentioned this. However you have yet to offer an example of perfect system {since the standard definition is ok here we go}Merriam-Webster Online Dictionary Since the onus is on you to back up your claim then I will allow you to clarify matters by offering an example of perfection according to the definitions herein {please follow numbering system to establish which definition you are refering to.} and tell us how the example is perfect in your own words.

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"The world is so exquisite, with so much love and moral depth, that there is no reason to deceive ourselves with pretty stories for which there's little good evidence. Far better, it seems to me, in our vulnerability, is to look Death in the eye and to be grateful every day for the brief but magnificent opportunity that life provides." - Carl Sagan, Billions and Billions

georgeculolias Now you have both my curiousity and your own declaration to satisfy. How is the results of how you live your life proof of God's existence to you?

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"The tragedy of life is not so much what men suffer, but rather what they miss."Thomas Carlyle