Hello again my friend

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Sunday worshippers are not lost. Gods people are in every Church. It is like when one is a babe, we do not know all of God's will untill we grow in grace and the knowledge of God's WORD. When we come to Christ we are not held accountable to God for the things he has not yet revealed to us (see James 4:17; Acts 17:30-31)
As long as we are living up to all the knowledge that God has revealed to us then whatever church we may be in, then we are still his people (John 10:16).
As we grow in grace as Christians, God reveals more of himself to us through his Word so that we canhave a closer walk with him. That also means we start learning about the things in our lives that are stopping us from getting closer to Jesus (sins we did not know were sins before).
We only stop becoming his people when he reveals his Word to us and we choose to reject it. Men love darkness rather than light because their deeds where evil (John 3:19-20).
God knows that many have rejected the 4th commandment out of ignorance because this is what they have been taught since Children handed down from the Mother Church to all Protestantism.
The time is coming and now is however that God is calling his people out from following man made teachings and traditions to follow him according to his WORD...
JOHN 10:16, And other sheep I have, which are not of this fold: them also I must bring, and they shall hear my voice; and there shall be one fold, and one shepherd.
JOHN 4:24 God is a Spirit: and they that worship him must worship him in spirit and in truth.
REVELATION 14:6-12,
[6], And I saw another angel fly in midheaven, having the everlasting gospel to preach unto them that dwell on the earth, and to every nation, and tribe, and tongue, and people,
[7], Saying with a loud voice, Fear God, and give glory to him; for the hour of his judgment has come: and worship him that made heaven, and earth, and the sea, and the fountains of waters.
[8], And there followed another angel, saying, Babylon is fallen, is fallen, that great city, because she made all nations drink of the wine of the wrath of her fornication.
[9], And the third angel followed them, saying with a loud voice, If any man worships the beast and his image, and receives his mark in his forehead, or in his hand,
[10], The same shall drink of the wine of the wrath of God, which is poured out undiluted into the cup of his indignation; and he shall be tormented with fire and brimstone in the presence of the holy angels, and in the presence of the Lamb:
[11], And the smoke of their torment ascends up forever and ever: and they have no rest day nor night, who worship the beast and his image, and whosoever receives the mark of his name.
[12], Here is the patience of the saints: here are they that keep the commandments of God, and the faith of Jesus.
No one is lost until they have the opportunity to hear God's WORD and choose to reject it in order to continu in a life of known unrepentant sin.
Jesus is always knocking at the door it is up to us to choose to believe and follow his WORD.
God's sheep hear his voice, take up their cross and follow him.
God bless my friend