Why the world does not know God

The world does not know God because it does not care about God. People care about themselves, about their own lives, their own future, their own ambitions. They care to promote themselves, to preserve themselves but they have no business with God. They care about not ending up in hell and therefor they want salvation but they don't care about Jesus Christ, they don't care about the kingdom of God. That is why Jesus will say to most people, and even believers, He will say to them:"Go away I never knew you, you workers of wickedness." They never cared for Jesus, they never sought Him, they never found Him, they never got to KNOW Him.
If we seek Jesus we will find Him. If we draw closer to Him He will draw closer to us and He will reveal Himself to us. If you truly seek Jesus from your heart, cry out to Him, pray, fast, yearn for Him, He will reveal Himself to you and you will know that Jesus Christ is God. You will know the truth and the truth will set you free. He will teach you and He will guide you and you will know Him for real. But if you are not interested and you don't care He will not force Himself on you but when you come to the end of the line and you stand before Him, He will turn you away because you never cared.
Do you care about Jesus Christ? Do you care about God? Then SEEK Him with all your heart. Pray, fast, call out to Him, cry out to Him and He will reveal Himself to you quickly.
Seek Him and you will find Him, and you will know Him for REAL.
May Jesus bless you.