you said: "It was begun by the apostate MARCION who tossed out the Old Testament Jehovah and substituted the Pauline concept of merciful Jesus."...
indeed...God said: "but showing mercy to thousands, to those who love Me and keep My commandments." exodus 20:6
AND THEN He sent His beloved Son and showed His mercy to all mankind who WOULD love Him and keep His commands. john 3:16-18
of course one must turn to the Light while it shines..."Then Jesus said to them, “A little while longer the light is with you. Walk while you have the light, lest darkness overtake you; he who walks in darkness does not know where he is going. While you have the light, believe in the light, that you may become sons of light.” These things Jesus spoke, and departed, and was hidden from them.
But although He had done so many signs before them, they did not believe in Him, that the word of Isaiah the prophet might be fulfilled, which he spoke:
“Lord, who has believed our report?
And to whom has the arm of the L ord been revealed?” john 12:35-38
or you can not believe..."Therefore they could not believe, because Isaiah said again:
“He has blinded their eyes and hardened their hearts,
Lest they should see with their eyes,
Lest they should understand with their hearts and turn,
So that I should heal them.” john 12:39-40
there was a time that one was at the mercy of the "gods/judges" of this system...if no one saw the offense?...now however...Jesus magnifies the law to everyone who God has shown mercy to...ie: everyone who has heard the gospel of salvation. He who reads hearts and minds judges..."For if we sin willfully after we have received the knowledge of the truth, there no longer remains a sacrifice for sins, but a certain fearful expectation of judgment, and fiery indignation which will devour the adversaries...Anyone who has rejected Moses’ law dies without mercy on the testimony of two or three witnesses. Of how much worse punishment, do you suppose, will he be thought worthy who has trampled the Son of God underfoot, counted the blood of the covenant by which he was sanctified a common thing, and insulted the Spirit of grace? For we know Him who said, “Vengeance is Mine, I will repay,” says the Lord. And again, “The L ord will judge His people.” It is a fearful thing to fall into the hands of the living God." hebrews 26-31 <cf. paul<