Dear Grace777,
I have only ever been honest with you but you do not believe God's Word. Let God's Word be true and every man a liar (Acts 5:29). When anyone puts their own words in place of the Word of God and ignores what God says in order to hold onto the teachings and traditions of man this is not honest. In times of ignorance God does not hold us accountable but when he gives us a knowledge of His truth through His Word he expects us to repent and follow him. We follow the Sabbath as outlined in Ex 20:8-11 as a Holy day because God asks us to and we follow Him because we love Him. Jesus is the creator and maker of this day (Gen 2:1-3). Jesus said he made this day for us and He is the Lord of it and we should follow him (Mark 2:27-28; Matt 16:24). It is the "Lord's Day" we should be happy and rejoice in it because God made it for us (Ps 118:24).
Here tell me what these scriptures mean and you have answered your own question?
Jam 4:17
Therefore to him that knows to do good, and does it not, to him it is sin.
Act 17:30
At times of this ignorance God winked at; but now commands all men every where to repent:
1John 3:4,
Whosoever commits sin transgresses also the law: for sin is the transgression of the law.
Jam 2:8-12,
If you fulfill the royal law according to the scripture, Thou shalt love thy neighbor as thyself, ye do well: But if ye have respect to persons, ye commit sin, and are convinced of the law as transgressors. For whosoever shall keep the whole law, and yet offend in one point, he is guilty of all. For he that said, Do not commit adultery, said also, Do not kill. Now if thou commit no adultery, yet if thou kill, thou art become a transgressor of the law. So speak ye, and so do, as they that shall be judged by the law of liberty.
Isa 55:6-7,
Seek ye the LORD while he may be found, call ye upon him while he is near: Let the wicked forsake his way, and the unrighteous man his thoughts: and let him return unto the LORD, and he will have mercy upon him; and to our God, for he will abundantly pardon.
God bless you