I do not agree with you concerning the Sabbath. While I am convinced that we must obey Scripture, and that our hearts should desire to because we love Him, I do not believe that Scripture teaches that the Sabbath must be observed. The 7th Days are not rightly dividing the Word in this matter, and to make matters worse they over emphasize the day. We are told, as believers, not to do this. The reason is because it was only a shadow of Christ. See the whole chapter of Colossians 2
Colossians 2:16-19
16 Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days:
17 Which are a shadow of things to come; but the body is of Christ.
18 Let no man beguile you of your reward in a voluntary humility and worshipping of angels, intruding into those things which he hath not seen, vainly puffed up by his fleshly mind,
19 And not holding the Head, from which all the body by joints and bands having nourishment ministered, and knit together, increaseth with the increase of God.
First of all, the law was changed when the priesthood changed. That is why we no longer sacrifice animals. Christ is now our priest, our sacrifice, and He is our rest. Hebrews 7
Hebrews 7:19
19For the law made nothing perfect, but the bringing in of a better hope did; by the which we draw nigh unto God.
Belief in Him is our rest, for He is our rest.
Hebrews 4:1-10
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.
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.
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.
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.
5 And in this place again, If they shall enter into my rest.
6 Seeing therefore it remaineth that some must enter therein, and they to whom it was first preached entered not in because of unbelief:
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.
8 For if Jesus had given them rest, then would he not afterward have spoken of another day.
9 There remaineth therefore a rest to the people of God.
10 For he that is entered into his rest, he also hath ceased from his own works, as God did from his.
We are told not to judge others concerning whether they esteem one day above another or not...because this part of the law was changed and now has become figurative of the spiritual life of the believer...because we have Christ. Mind you, I am not saying the whole of the law has changed, but only those parts where Scripture teaches it. This is taking God’s Word as a whole, and rightly dividing the Word of truth. Both the Old Testament, and the New Testament are true, and do not contradict each other. We should be very careful that we judge righteously, we are not to judge in regards to a day. Romans 14
Romans 14:4-19
4 Who art thou that judgest another man's servant? to his own master he standeth or falleth. Yea, he shall be holden up: for God is able to make him stand.
5 One man esteemeth one day above another: another esteemeth every day alike. Let every man be fully persuaded in his own mind.
6 He that regardeth the day, regardeth it unto the Lord; and he that regardeth not the day, to the Lord he doth not regard it. He that eateth, eateth to the Lord, for he giveth God thanks; and he that eateth not, to the Lord he eateth not, and giveth God thanks.
7 For none of us liveth to himself, and no man dieth to himself.
8 For whether we live, we live unto the Lord; and whether we die, we die unto the Lord: whether we live therefore, or die, we are the Lord's.
9 For to this end Christ both died, and rose, and revived, that he might be Lord both of the dead and living.
10 But why dost thou judge thy brother? or why dost thou set at nought thy brother? for we shall all stand before the judgment seat of Christ.
11 For it is written, As I live, saith the Lord, every knee shall bow to me, and every tongue shall confess to God.
12 So then every one of us shall give account of himself to God.
13 Let us not therefore judge one another any more: but judge this rather, that no man put a stumblingblock or an occasion to fall in his brother's way.
14 I know, and am persuaded by the Lord Jesus, that there is nothing unclean of itself: but to him that esteemeth any thing to be unclean, to him it is unclean.
15 But if thy brother be grieved with thy meat, now walkest thou not charitably. Destroy not him with thy meat, for whom Christ died.
16 Let not then your good be evil spoken of:
17 For the kingdom of God is not meat and drink; but righteousness, and peace, and joy in the Holy Ghost.
18 For he that in these things serveth Christ is acceptable to God, and approved of men.
19 Let us therefore follow after the things which make for peace, and things wherewith one may edify another.
Scripture shows in several places that early believers gathered on the first day of the week. I have heard two theories about this. The first being that this is when Christ was resurrected and it is in honor of that, and the second being that it was to allow for the Jewish believers to observe the Sabbath because of their law, while still being able to gather on the first day of the week with believers. Both make practical sense I guess, but I think it is because, as these Scriptures teach us, Christ was our rest, the former holy days were no longer needed, and the days that were meant as a promise of Him are now shadows...because we have Him. Praise God!
Blessings