musicllover-
I am not saying they weren't worshipping at those meetings, I like you believe that we should worship 24x7. The word translated worship in Hebrew is avodah (serve/work). We are His servents, and as such we serve Him every day, which means we obey His commands. Consequently, in order to worship Him on the Sabbath, we need to stop working, and hold a holy convocation, and set the day apart. This is the Biblical mandate for the Sabbath. He is the judge of how well we obey (heart attitude, thoughts, etc), but there are physical actions involved in the worship of God.
Let me say further that yes, we could keep the Sabbath and at the same time commit other sins, and it would not cancel them out, or somehow make it so that God will save us.
Let me also address the word belief, because I think that this word is misunderstood. Belief as it is used in the Bible implies action based on trust in God's character and word.
James 1:22 - 25
22 But prove yourselves doers of the word, and not merely hearers who delude themselves. 23 For if anyone is a hearer of the word and not a doer, he is like a man who looks at his natural face in a mirror; 24 for once he has looked at himself and gone away, he has immediately forgotten what kind of person he was. 25 But one who looks intently at the perfect law, the law of liberty, and abides by it, not having become a forgetful hearer but an effectual doer, this man will be blessed in what he does
Note in the above passage that the law of liberty (God's law) is compared to a mirror where we see the image of ourselves as God would have us. God's law describes the image of the Messiah and how to demonstrate in a real way love for God and our neighbor.
Look also at this verse
Romans 2:13-16
13 for it is not the hearers of the Law who are just before God, but the doers of the Law will be justified. 14 For when Gentiles who do not have the Law do instinctively the things of the Law, these, not having the Law, are a law to themselves, 15 in that they show the work of the Law written in their hearts, their conscience bearing witness and their thoughts alternately accusing or else defending them, 16 on the day when, according to my gospel, God will judge the secrets of men through Christ Jesus.
Here, the Gentiles do what the Law requires even though they do not have the Law. In this case, Paul is using the term Law to denote the Jewish leadership. Why do I say that? Because the Jewish leadership forced Jews to keep the Law (and all their additions), but not Gentiles unless they were circumcised and became Jews. Therefore the Gentiles are a Law to themselves (they enforce the Laws on themselves) and their conscience bears witness when they keep or break them. Does this contradict Eph. 2? Not at all, neither of the above verses is dealing with how to be saved, but how to live after you are saved. The fruit of salvation is that we keep the Law of God with all our heart, and when we break it, then we repent and God forgives. This is the duty of Israel, and since all Christians are a part, it is our Christian duty.
You can meet any day of the week to sanctify and sing to God, but make sure you also set apart the days God said to, that is worship too, and not setting them apart is "knowing what is good to do and not doing it" (Jas. 4:17)
Let me leave you with a final thought in the form of a parable-
There was a woman who was wooed by a man and gave herself over to him. Eventually he was abusive to her, and would not let her go. After some time, another man came and freed that woman, and married her and treated her well, and showed her real love. The man and his bride would comemorate the special events in their relationship every year, until one year when the woman forgot about an event. As the years went on, more of the special times were forgotten, and eventually, the woman started celebrating the special events with her husband on the days of her former lover.
If you were this man, how would you feel?
Peace and Blessings brother,
-oneBook
