Does the Bible say every day should be a day of worship for Christians?
Yes, in this age of grace every day should become a day of praise and worship, and the Christian walk should not depend on a one-day-a-week service. That does not require a formal service or a church open seven days a week, though Paul refers to the first day for formal gathering.
Les explains that in this age of grace, because of all God has done on our behalf and because we are worthy of none of it, every day should become a day of praise and worship. That does not mean a formal service or a church door open seven days a week, but it does mean the Christian walk should not depend on a one-day-a-week service or worship. He says this is perfectly in accord with what Paul said, and when it comes to the formal coming together of God's people, Paul refers to the first day.