This is God's universe. There are always new things to learn. You will never ever know everything - not even after a billion billion years. Knowing that you can never know everything, how can you then pass judgment on others based on your current and limited understanding?
It is OK to think, to use your brain to at least attempt to understand what you see God doing.
Do you think it's disrespectful to look upward and ask questions? Perhaps you think it's pointless?