Please Read 1 Corinthians 1:20-25 2:13-14
God saw fit in His great wisdom not to allow mankind through it's wisdom to know Him. He also was pleased to let what people call foolishness (believing in Christ death for the sins of the world) be the only way to be saved. God is spirit. He can only be discerned by His spirit. (John 16:13 Luke 10:22) So many have tried to figure God out through human brain power. It is most frustrating. Everything about God goes against man's logic. As the heavens are higher than the earth, so are God's ways higher than our ways, and His thoughts higher than our thoughts. (Isaiah 55:9)
I've heard many controversial questions raised about God. Some of them seemed to make a lot of sense (humanly). The Bible just doesn't add up to some, and it never will. They are examining Almighty God from a mere human standpoint. Can what is created sit in judgment on it's creator? No. But the arrogant do just that to their demise.
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Please Read Luke 11:13 Matthew 7:7-11
Only God's spirit can open our minds and hearts so that we may know Him. Jesus says the Father will give the Holy Spirit to those who earnestly ask Him. Ask and you shall receive, seek and you will find, knock and the door will be opened. For all who ask receive, those who seek find, and for those who knock the door is opened. (Hebrews 11:6)