One man considers one day more sacred than another; another man considers every day alike. Each one should be fully convinced in his own mind. He who regards one day as special, does so to the Lord. He who eats meat, eats to the Lord, for he gives thanks to God; and he who abstains, does so to the Lord, and gives thanks to God. For none of us lives to himself alone and none of us dies to himself alone. If we live, we live to the Lord; and if we die, we die to the Lord. So, whether we live or die, we belong to the Lord. (Romans 14:5-8)
A past co-worker of mine was a Seventh Day Adventist, a nice, caring man. Fully convinced in his mind the Sabbath should be on Saturday, he asked me why I celebrated the Sabbath on Sunday. He considered Saturday more sacred, but I only worship on Sunday because it is the only time worship is offered at my church. I would celebrate any day that worship offered. As we’ve read in Romans, we’re no longer under the Law that indicated the Sabbath was Saturday. We’re under the law of love. I might disagree with my friend’s thinking that Saturday is the only day we should worship at church, but I would never express my disagreement to him because he is fully convinced in his own mind, he gives thanks to God, and he lives to the Lord. We both belong to the Lord and that is what’s important.
All Christians belong to God; we eat, give thanks, and abstain to Him. We have interesting Bible discussions with differences in viewpoints which God sees honoring Him. If He wishes to change our viewpoint, He will. Our relationship of love, not our viewpoints, is what matters. God reads our hearts, but we cannot and should not try to read each other’s hearts.