Titus 1

Paul gave Titus a list of qualifications for church elders, among which was listed a firm grasp of the word of God in order to teach others and dispel the lies spread by false prophets.

To learn who God is and what He wants us to do, we must be taught by someone who has studied His word in depth. This is another reason why Christians need to go to church. God is everywhere, so we don't go to church to see God. We go to be fed and to learn more about our Lord from those who have been ordained to teach His word.