You also have the audacity of predicting punishment for Saturday sabbath breaking when the New Testament says it is OK to treat all days alike. There is divinely offered choice of ceremonial framework here, friend; no ifs, ands, or buts about it. It might be beneficial to some to go Jewish in a Christian framework. But friend, grace is the audacious thing. Not punishment.
The New Testament says no such thing, if Romans 14 is being referred to here. It merely says that certain people do esteem all days alike, but does not say so about God. Read Romans 6:1-2 and Jude 1:4 to not be mistaken about what grace is. Trying to scrap the law, over whose breach Israel and Judah were both punished, is a doctrine too like unto the Koran—God does not change, and nobody gets away with it. If anyone is not clear that the law still stands and for eternity, also read 1 John 3:4.