If we could please God by our own efforts, Jesus died for nothing.
Who says we are to please God by our own efforts? We are saved only by GRACE through FAITH and NOT of OURSELVES it is a GIFT of GOD and not of WORKS lest any man should boast. Without Christ you can do nothing. If you do NOT ABIDE IN HIM (the Word) you cannot FOLLOW him and walk on water.
IF your FAITH does not have the FRUIT of OBEDIENCE then you are still in your SINS because you have rejected the GIFT of God's dear Son (James 2:18: 20: 26).
If your tree has no FRUIT it will be cast down and thrown into the FIRE come judgement day (Matthew 7:12-23). Now also the axe is laid unto the root of the trees: therefore every tree which bringeth NOT forth good fruit is CUT down, and cast into the fire (Matthew 3:10).
If you are still in your SINS when he gives you a KNOWLEDGE of the truth then you do not KNOW him who calls you in LOVE to LOVE another as he first LOVED you.
Whether or not we observe the 7th day Sabbath has no bearing on our relationship with God
This is where God's Word disagrees with you. SIN is the transgression of God's LAW (10 Commandments). All those who KNOWINGLY practice SIN will NOT enter into God's KINGDOM.
Hebrews 10
26, For IF WE SIN AFTER WE HAVE RECEIVED THE KNOWLEDGE OF THE TRUTH, THERE REMAINS NO MORE SACRIFICE FOR SINS,
27, BUT A CERTAIN LOOKING FORWARD FOR OF JUDGEMENT AND FIERY INDIGNATION, WHICH SHALL DEVOUR THE ADVERSARIES.
31, It is a fearful thing to fall into the hands of the living God.
Yep SIN will keep ALL who KNOWINGLY practice it OUT of God's KINGDOM.
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God's 4th commandment is one of the ten (Exodus 20:8-11) and if we KNOWINGLY break it like any of the other commandments we stand guilty before God of SIN (Exodus 20:1-17).
If we break any of God’s Laws we stand guilty before God in SIN (James 2:11; Romans 7:7; 1 John 3:4; Romans 3:20). This includes the 4th commandment which is one of the ten (Exodus 20:8-11)
There is not one scripture in ALL of God's Word that says God's 4th Commandment has now been ABOLISHED and we are now commanded to keep Sunday as a Holy day.
Sunday worship is a tradition and teaching of man that has lead many to break the commandments of God. Jesus says that if we follow the traditions of man that break the commandments of God we are not following God (Matthew 15:3-9)
Who should we follow the teachings and traditions of men or the Word of God? Who should we believe the Words of men or the Word of God?