"Let us hold fast the confession of our hope without wavering, for he who promised is faithful. And let us consider how to stir up one another to love and good works, not neglecting to meet together, as is the habit of some, but encouraging one another, and all the more as you see the Day drawing near."
"For where two or three are gathered in my name, there am I among them."
1 Corinthians 5:4
"When you are assembled in the name of the Lord Jesus and my spirit is present, with the power of our Lord Jesus..."
"On the first day of the week, when we were gathered together to break bread, Paul talked with them, intending to depart on the next day, and he prolonged his speech until midnight." [Notice what else happened on the first day of the week...the resurrection of our Lord! (Matt. 28:1; Mark 16:2, 9; Luke 24:1; John 20:1, 19)]
1 Corinthians 16:2
"On the first day of every week, each of you is to put something aside and store it up, as he may prosper, so that there will be no collecting when I come."
[All this Scripture is from the English Standard Version of the bible.]
From the above passages I believe we have a precedent that the disciples/apostles and early Christians gathered together on the first day of the week...the day of the resurrection. We commanded to not neglect meeting together. Where 2 or more are gathered there Christ is with us. Also, how are we to live out the love one another passages if we never see each other? [John 13:34-35, etc.] Also, we're to worship in spirit and truth [John 4:23]. No church is perfect, but when you no longer feel that you can worship the Lord in spirit and truth you need to seek fellowship, accountability, and worship with another group of believers somewhere.
Something to think on...
[I know this is a simplistic answer to why we go to church, but I believe these are pretty good simplistic answers...what do you think?]