Okay thanks. That helps me to understand where you are coming from. The next question is, where do we see a Sabbath-keeping church in the New Testament? If the church strayed from the practice early on, where is the proof that there was a practice to stray from?
That is a much longer answer brother, but I will do my best to keep it short.
1. Sabbath keeping Church in NT under Grace. On the Sabbath day.
Acts 13:14, Acts 13:42-44, Acts 15:21, Acts 16:13, Acts 17:1-3, Acts 18:4
2. Practice to Stray from. A rest remains to those who believe.
Hebrews 4:1-11
First Paul tells us to fear if the Promise of rest were to have left us.
1. Let us therefore fear, lest, a promise being left us of entering into his rest, any of you should seem to come short of it.
The Gospel did not profit them who heard but did not have faith.
2 For unto us was the gospel preached, as well as unto them: but the word preached did not profit them, not being mixed with faith in them that heard it.
We who believed enter into rest as we were commanded to by God when he swore to us that if we enter into the rest set by him after he had finished the works from the foundation of the world.
3 For we which have believed do enter into rest, as he said, As I have sworn in my wrath, if they shall enter into my rest: although the works were finished from the foundation of the world.
That is why he spoke in a certain place(the Moral law) on this matter, showing that even he did rest on this Seventh day sanctifying it as a everlasting sign and covenant between us.
4 For he spake in a certain place of the seventh day on this wise, And God did rest the seventh day from all his works.
And we are told again to continue to enter into his rest(keep the sabbath day) to receive his promise.
5 And in this place again, If they shall enter into my rest.
Seeing this, we know it remains(the sabbath day remains) that some must enter therein(those of faith/belief). But to those to whom it was first given did not keep it because of their unbelief.
6 Seeing therefore it remaineth that some must enter therein, and they to whom it was first preached entered not in because of unbelief:
When the Lord spoke to david he again limited a certain day(to david was again given the seventh day rest).
7 Again, he limiteth a certain day, saying in David, To day, after so long a time; as it is said, To day if ye will hear his voice, harden not your hearts.
If Christ had come to give us another day of rest(another sabbath) then would he not have spoken of another day? Christ never mentioned another day for sabbath worship, it cannot be found anywhere in the New Testament.
8 For if Jesus had given them rest, then would he not afterward have spoken of another day.
Because no other day was given by Christ or YHWH there remains a rest to the people of God. The same Sabbath day rest shown and spoken of since the beginning of the bible, being shown all the way into the new heavens and the New earth.
9 There remaineth therefore a rest to the people of God.
Those that enter into God's rest(seventh day sabbath) cease from their own works, after the example of God himself ceasing from his.
10 For he that is entered into his rest, he also hath ceased from his own works, as God did from his.
We are to labour to enter enter into that same rest(same sabbath day) lest we fall away from God as those others did from unbelief.
11 Let us labour therefore to enter into that rest, lest any man fall after the same example of unbelief.
The Rest spoken of throughout this Chapter is the Seventh day rest(Sabbath day).
That's about as short an answer as I can get it brother.