Truth speakers confirm God's Law remains intact
IS 8:20 To the law and to the testimony: if they speak not according to this word, it is because there is no light in them.
Because Jesus spoke truth, he confirmed this
LK 16:17 And it is easier for heaven and earth to pass, than one tittle of the law to fail.
God said He would 'prove/test' us to see if we would cling to Him and His Law, or if we would prefer to follow a lie
Deu 13:2 And the sign or the wonder come to pass, whereof he spake unto thee, saying, Let us go after other gods, which thou hast not known, and let us serve them;
Deu 13:3 Thou shalt not hearken unto the words of that prophet, or that dreamer of dreams: for the LORD your God proveth you, to know whether ye love the LORD your God with all your heart and with all your soul.
Deu 13:4 Ye shall walk after the LORD your God, and fear him, and keep his commandments, and obey his voice, and ye shall serve him, and cleave unto him.
Paul preached an UNKNOWN god as warned of in Deut 13:2
ACTS 17:23 For as I passed by, and beheld your devotions, I found an altar with this inscription, TO THE UNKNOWN GOD. Whom therefore ye ignorantly worship, him declare I unto you.
The god which Paul promoted was actually Zeus, which the audience understood as Paul quoted Hymn to Zeus and agreed with the hymn that Paul and his audience are offspring of Zeus
ACTS 17:28 For in him we live, and move, and have our being; as certain also of your own poets have said, For we are also his offspring. (bold underlined are quotes from hymn to Zeus)
Jesus warned us not to heed anyone claiming to meet him in the desert after his ascension. The christ who Paul met in the desert on the road to Damascus, after Jesus ascended, was a different christ who quoted and promoted pagan concepts and lawlessness.
Paul admitted he suffered an angel/messenger from satan & preached that people should only heed him and not heed any messenger/angel from God, like Jesus, teaching a different gospel to Paul. Paul's 'good news' was God's Law was ended while the 'good news' from Jesus was that God forgives if we repent and turn to lawfullness.
God granted us consciences, yet Paul's conscience was faulty, since he claimed that he didn't know coveting was wrong until the law clarified that, so he finds God's law harsh in clarifying and judging Paul's lust as sin, so showed if you remove the law then you remove any clarification and guilt of sin.
ROM 7:7 What shall we say then? Is the law sin? God forbid. Nay, I had not known sin, but by the law: for I had not known lust, except the law had said, Thou shalt not covet.
ROM 7:8 But sin, taking occasion by the commandment, wrought in me all manner of concupiscence. For without the law sin was dead.
ROM 7:9 For I was alive without the law once: but when the commandment came, sin revived, and I died.
Paul is a test sent by God
EZEK 14:9 And if the prophet be deceived when he hath spoken a thing, I the LORD have deceived that prophet, and I will stretch out my hand upon him, and will destroy him from the midst of my people Israel.