The question arises to many skeptics - 'Why can't we see God?' True, if God does exists then why can't we see Him? With this is mind, let us think about some things. For example, If we do see God there wouldn't be any reason to worship Him by choice. We wouldn't worship Him by our own will knowing that He's right there, above us, watching our every step. Faith would not be necessary.
We do know that God created each person with an individual will - the power of choice. It's more like - God wants us to worship Him by choice. God didn't create us like robots or mindless slaves. He created us and gave us all wonderful minds - logic, ethics, reason - by which we can figure out His very existence. Above all things, He gave His Word - The Bible. And He gave His only begotten Son for our sins.
Remember Jesus once said: "Blessed are those who have not seen but yet believe."