As we can all see this is a topic that will never be settled corporately, but thank the Lord we can settle it in our hearts individually.
I'm sure this "Neutral" statement will draw some "Ire", but as I observe the Sabbath every Sunday, I am at peace in my heart and full of Joy that I was "Called" by the Holy Spirit Himself in Church to begin this one of Gods most Holy of desires for myself, this most gracious gift of His love. I am humbled and look forward to it as a constant reminder that I am one of His chosen, and that I am gifted with the priviledge of obeying the 10 commandments from my heart, not as a work, or as legalism or rule keeping or because I "Should, but because I love my Lord and do both out of deep respect and for Him and because He wants me to have the comfort of rest to look forward to and enjoy - PRAISE GOD.
A point of reconsideration may be necessary is "when" and "if" you judge a believer for not keeping the Sunday "sabbath", then what you had stated for keeping the sabbath is null and void, because "if" you tell them they have to obey to keep it, then no one can see you obeying it because you want to, see?
That is why there is no necessary obedience to keeping the sabbath day because He is in us and with us always for why we are guiltless for profaning the sabbath.
Romans 14:4 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.