Yes. Logic is required. Feelings are best shared naked in a hot tub with members of the opposite sex, and they don't prove anything but that people are subject to control by emotions.
OK, that sounds like more fun than arguing on an internet forum.
Interesting assumption. Let's pursue it.
Human intelligence evolved over eons as environmental pressures pushed the emergent hominid species into circumstances that demanded adaptation or death. Hominid developed tool use, artificial weapons, hunting skills, and advanced social organization reliant on larger brains and higher brain functions.
This is established science.
Agreed. The broad outline of the evolution of man is pretty well established. We do keep discovering surprises from time to time, like the existence of Neanderthal DNA in modern humans for example, or evidence of the so called "hobbit" in Indonesia.
What external environmental factors drove God into developing intelligence? Answer carefully, because by definition, there is no environment external to God, and hence no external factors to compel any nascent deity into sentience. One cannot honestly claim both that "intelligence came from something" and then argue that the alleged deity is eternal and hence it's intelligence came from nowhere.
Can we logically determine the nature of intelligence or the nature of god? Since you discount the possibility that god exists in whatever form, then let's examine the nature of intelligence.
Is it merely an adaptation to a lifestyle that involves the use of language, tools, etc.? If so, then which came first, the tools or the intelligence? Logically, the use of the trappings of intelligence came about because there was intelligence to develop them.
When did it all begin? If matter can neither be created nor destroyed, then it follows that matter has always existed. If it has always existed, then it follows that there is no beginning or end of matter. The stuff of the universe has always existed, then, whether or not it was in its present form. Time, then, has no beginning. Why, then, can we be so sure that intelligence has not always existed? If an eternal intelligence is not god, then what is it?
One can dishonestly make that claim, though.
Oh, I think we can claim that a lot of things are beyond human understanding, and many things are yet to be discovered. Why did god create intelligence? I would posit that intelligence was not created, but has always existed in one form or another. If a human life continues after the body dies, as is a belief of most religions, then it follows that it also existed before the body was created. A human being, then, is more than just a body, but an intelligence that has always existed and always will.
Otherwise there is a how to the existence of life (except for the little question of how it actually started) but no why. If we exist for a brief moment in time, then are gone forever, what does it matter that we've lived at all?