"But in vain they do worship Me, teaching for doctrines the commandments of men" (Matthew 15:9).
Are we offering acceptable sacrifices to the Lord? Sacrifices of humility? Brokenness? Spirit and truth worship? Or are we just going through the motions of Churchianity every week? We know how to put together a music program (three praise songs, three worship songs). We know how to take up offerings. We know how to preach and give an altar call. We know how to do all these things: but are we giving God what He wants?
It is a sad, but real fact: if God removed His presence from our church services, 99% of the activity would continue on as before, without interruption. We do not need God's Spirit to worship in the flesh: we can do that all by ourselves. But God will not accept this "worship." He looks the other way.