That makes no sense!! If you can not use logic to ascertain what God has decreed, how do you know whether or not your adhering to his precepts properly? How would you actually repent or believe in Jesus? Now, most certainly there are things we definitely do not have the mindset to "understand" about God, and even things I'm sure he hides from us, but to suggest human logic does not allow us to comprehend his way is highly obtuse.
Self-evidence, besides, how do you know your logical conclusion is correct? Not everyone is a Christian.