Oh yeah? Taboo by who? A secular Roman ruler who worshiped the sun god and Yeshua? 

Oye, bubbelah, bubbelah, do you have a bible?

Let's get connecting the Tanakh to the New Testament, nu?

Okay ya ready? Turn to Hebrews chapter 4. Now pray, shandai, Daven, or get real religious and do your oooooh Faaaatha, whatever your style! Just do it! Ask God to reveal truth to you and to help you get rid of all of your preconceived ideas.

Ready? a one and a two and a three and a READ!!!

Candles shmandles, they are nice and we try to light them every shabbat, but it's not about candles. It's about obedience! And what's the opposite of obedience? Oops!!

Check out Sh'mot (Exodus) 31:17 forever is forever. Adonai, the God of Abraham, Isaac and Jacob said that.

Ya need more examples? Okay! Get out your concordence and find out more! I'm not gonna do it for you! I know it and you need to...

There is not one God of the Old Testament and another God of the New Testament. Maybe you were born again and have become a new creature, but you can be sure that Adonai has not changed and he is not schizophrenic.  Observing Shabbat is a command for eternity!