This is going to sound like the party line, but I sincerely believe there are SO many reasons God gives us to "go to church" -- which I'll define here as Sunday worship but of course means more than that. Christ asks us to gather regularly for communion, which connects us to past, present and future, to Christ and to the saints around us, is a means of God's grace to us, and most of all reminds us of why we are Christians and whom we follow. Then Hebrews 10 offers a nice summary of "Why church?": "Let us consider how we may spur one another on toward love and good deeds. Let us not give up meeting together, as some are in the habit of doing, but let us encourage one another—and all the more as you see the Day approaching." So yes, mutual accountability -- both in growing in Christlikeness and, yes, even though Christianity is not about intellectual consent to propositions, we still meet to align our ideas about God with Scripture, the Spirit, and the Christian community, to avoid falling into subtle sins such as works-righteousness and such. And probably the biggest reason: we were designed to be relational beings, to be in deep relationship with God, and because since Pentecost the Spirit dwells in each Christ-follower, we can meet God among them.