No they aren't. They're just assuming that human reasoning is a tool they have at their disposal with which to address the question. They don't have to see it as "binding", whatever that means.
Reasoning, broadly speaking, is a process whereby we reach a conclusion via the application of formal logic to a question, and adjust our views and conclusions based on what is indicated by the available facts. In other words, reasoning is when we reach a conclusion based on facts, rather than interpreting facts to fit a conclusion.
The God claim is any claim about the existence of any entity, spirit or force that can accurately be described as a God (i.e: a supernatural, intelligent agency responsible for the creation and/or maintenance of the Universe or some aspect of the Universe).
Human reasoning has lead to realisation of a great many objective truths about our Universe. To dismiss it merely because it hasn't reached nigh-impossible heights is the definition of short-sightedness.
Good thing you're completely exempt from that then, eh? I don't doubt you have the ability to raise above us mere mortal humans with your vastly superior intellect, but unfortunately the rest of us simply have to make do with what we have.
Except for the people who don't make assumptions based on faith, and withhold belief until such a time as they have a good reason not to. But, lemme guess, you're one of these miraculous, special people who rise above this "basic logic" thing, right?
The important thing is that you've found a way to feel superior to and patronize both. Well done!