If you did not want to discuss the Trinity why did you bring it up? Although I agree that we are saved by God's grace through faith in Jesus Christ, not all who profess faith in Jesus are or will be saved.
Matthew 7:20-23
20 "So then, you will know them by their fruits. 21 "Not everyone who says to Me, 'Lord, Lord,' will enter the kingdom of heaven; but he who does the will of My Father who is in heaven. 22 "Many will say to Me on that day, 'Lord, Lord, did we not prophesy in Your name, and in Your name cast out demons, and in Your name perform many miracles?' 23 "And then I will declare to them, 'I never knew you; depart from Me, you who practice lawlessness.' NAS
What is lawlessness? Is lawlessness not disobedience to the Father who said "I am the Lord your God" and "you shall have no other god before Me"? What is the Law of Christ? If you take Jesus at his word his Law is:
Matthew 22:36-40
36 "Teacher, which is the great commandment in the Law?" 37 And He said to him, "'You shall love the Lord your God with all your heart, and with all your soul, and with all your mind.' 38 "This is the great and foremost commandment. 39 "The second is like it, 'You shall love your neighbor as yourself.' 40 "On these two commandments depend the whole Law and the Prophets." NAS
How is it possible to love the Lord you God with all your heart, soul, and mind if one does not accept the Father as the only true God? I am not in a position to judge anyone and that includes Trinitarians, however how does the Father view the Trinity is the question all Trinitarians need to answer for themselves. As to how I dealt with John 17:3 in the past, I did what all Trinitarians do and that is avoid that verse by concentrating on interpretations of John 1:1-18, Philippians 2:6, and etc.
Now, let's get back to herald's purpose of this thread.
The Ten Commandments = One Covenant. James 2:10,11 tells us, that, if we break one of the commandments, we become transgressors of His law and are guilty of breaking all of them.
The fourth commandment is the mark of God's authority as Creator and Redeemer. Deut 5:15. Our Creator: Jesus (John 1:3) calls the seventh day, "My holy day." Isa 58:13.
Every thread herald starts is to advocate keeping the weekly Sabbath. Also Jesus did not create the world, the Father alone created all that exists, which is another reason for Trinitarians to rethink this traditional doctrine.
Isaiah 44:24
24 Thus says the LORD, your Redeemer, and the one who formed you from the womb,
"I, the LORD, am the maker of all things,
Stretching out the heavens by Myself,
And spreading out the earth all alone,
NAS
The 10 Commandments are part of the Old Covenant, the New Covenant is unlike the Old.
Jeremiah 31:30-34
31 "Behold, days are coming," declares the LORD, "when I will make a new covenant with the house of Israel and with the house of Judah, 32 not like the covenant which I made with their fathers in the day I took them by the hand to bring them out of the land of Egypt, My covenant which they broke, although I was a husband to them, "declares the LORD. 33 "But this is the covenant which I will make with the house of Israel after those days," declares the LORD, "I will put My law within them, and on their heart I will write it; and I will be their God, and they shall be My people. 34 "And they shall not teach again, each man his neighbor and each man his brother, saying, 'Know the LORD,' for they shall all know Me, from the least of them to the greatest of them," declares the LORD, "for I will forgive their iniquity, and their sin I will remember no more."
NAS
The New Covenant consists of two commandments, those commandments are those Jesus cited as the two upon which hang the whole law and the prophets, which is why both Paul and James refer to "love your neighbor as yourself" as being the fulfillment of the Law.