Very well, I believe that you are a Christian, as am I. And for the record, I don't think drinking alcohol is in itself immoral (although I don't do it), because that position isn't supported by scripture, but I do support certain traditions related to business on Sundays.
I do not support any laws, traditional or not, that violate the rights of people for the benefit of other people.
Elected officials enact such laws in return for power by pandering to certain groups of people.
The concept is simple, they will use force in return for power. Not very Christian in my view.
You can support those traditions all you want. But the point me and various others here are trying to make to you is that is is immoral to use the gun-weilding coercive force of government to compel others to support those traditions as well.
In the Bible the sabbath is saturday isn't it?