Unblessing the Seventh Day
robbing God of His glory

Rejecting the creation is robbing God of His glory and that is well stated in the following excerpt.
To reject a six–day creation is to unbless the seventh day. It robs God of the glory that is due His name. If everything evolved from nothing, or if creation was spread over eons of time, there was no seventh day. Thus any view of this passage other than a literal six–day creation totally confounds the blessing of the seventh day.
On the other hand, if we believe what the Bible says, then every seventh day is a memorial and a reminder that God created the entire universe in one week. And for that glorious accomplishment He deserves our praise.
What does this mean in practical terms? It suggests that Saturday should be identified in our minds with the completion of creation. Each week thus ends with a perpetual reminder that God created everything in six days’ time. It is a day to remember the glory of the Creator. In Western society, where Saturday often means a day off work, it is an ideal day for enjoying His creation and delighting with Him in the goodness of His work. Just as Sunday is set aside for celebrating the finished work of the Savior, Saturday ought to be a remembrance of the finished work of the Creator.
John MacArthur, The Battle for the Beginning: The Bible on Creation and the Fall of Adam (Nashville, TN: W Pub. Group, 2001), 188–189.
