Frankly, that is the only weakness my atheism/ agnosticism has had, for a long, long time. That, and the related property of our minds not being able to fathom a physical limit for the universe: It’s not just very big, but the space has no limit, in the most technical of definitions.
Admitting that the concept of God is beyond human understanding is not necessarily atheism.
Claiming to know the mind of God and be privy to God’s understanding of the physical world is not necessarily Christian.