If you don’t have a great answer to the question, “Why do you go to that church?” then you also don’t have a great answer to the question, “Why do you go to church?” If you go to that church for shallow reasons, you go to church for shallow reasons. If that church and the church aren’t the same thing, it isn’t necessary to go to that church.
The less importance we attach to denominations, the less importance we attach to church altogether. The less our church means to us, the less likely we are to go to any church at all. The declining importance of denominations rather neatly coincides with the decline in church attendance.