We go over and over this. God taught the Hebrews about Himself through their daily routines. So how does our physical habits interact with our spiritual habits? That is a basic of what it comes down to.
When the Hebrews did only the physical, like when the pharasees prayed by making a show of it for people, Christ said that prayer was useless. When the gospel went out to the pagans, and the Jews said that if you accept the gospel you also have to accept all the things God told us to do like being kosher and circumcision, and all our habits, Paul said no way.
If you had been a pagan in the year 50, and heard about Christ so you became a Christian, how would you like it if someone said that going along with it you have to take your boys for circumcision, change when you go to worship, and all the way you eat? We are still acting like those pagans acted, grabbing tight to that we don't have to. I have even heard people brag about how they do absolutely nothing in their day to day physical living to reflect their worship of God. Or gossip and put down God for the way He taught the Hebrews!
We are permitted to not do anything at all except worship our Lord in our hearts. But is it always wise to do nothing? I have experimented with adding some rituals to my daily walk. They can be a blessing in many many ways. I think people are cutting off their nose to spite their face when they point out they can mean nothing. Of course, they can mean nothing. It is your choice. They CAN mean something.
I think that because we make a big show of never relating what we do physically to our spiritual being, it has belped the entire church (biblical church) become lukewarm. And when they brag about what they don't do, and put down people who do these things with judging them, I think it is being sinfully disobedient.