We need to remember that there is a deeper reason why the church has worshiped on Sunday mornings--one that is still relevant today.
When Jesus rose from the grave, he was doing more that conquering death. He was doing more than displaying the vindication of God. He was doing more than giving us hope for our own resurrections in the age to come. Jesus' resurrection is the first fruit of the New Creation. His raised and transformed body, as Paul lays out in 1 Corinthians 15 and Romans 8, is indicative of the transformation that awaits all the saints and the creation itself.
Following the creation account in Genesis 1, Sunday is the first day of creation. So Jesus is raised on a Sunday to mark the beginning of God's new creation. This fact was not lost on the early Christians. They did not worship on Sunday because it was convenient. They gathered on Sundays because they were people of the new creation, people of the resurrection, and people of the in-breaking Kingdom of God.
The move away from Sunday worship can have many motivations, and some of them are honorable and even Spirit-guided... Ed Stetzer - Morning Roundup - July 31, 2012