Here is How it Is
We can talk about the mark of the beast all day long, but at the end of the day, you will need to decide whether to keep the Ten Commandments (including the sabbath) or not.
|Law||Day of worship||Judgment|
|Ten Commandments||Sabbath||Seal of God|
|Lawlessness||Sunday||Mark of the beast|
The mark of the beast = knowingly keeping Sunday instead of Sabbath.