Of course the Gospel had been corrupted. The Judaizers were trying to get everyone under the law instead of grace.
In Contrast To Grace, which is Unmerited; the Law's blessings were Conditional.
And in your ignorance of this Dispensational Distinction and or Change from one Distinction within one Dispensation...to one That Differs within a Different Dispensation...you have just called the Lord...a Judaizer and are not even aware you did...
For you ignorantly hold that MML&J is the Body's "instruction in righteousness" but the following is actually a Conditional Blessing under...the Law.
Mark 10:17 And when he was gone forth into the way, there came one running, and kneeled to him, and asked him, Good Master, what shall I do that I may inherit eternal life? 10:18 And Jesus said unto him, Why callest thou me good? there is none good but one, that is, God. 10:19 Thou knowest the commandments, Do not commit adultery, Do not kill, Do not steal, Do not bear false witness, Defraud not, Honour thy father and mother. 10:20 And he answered and said unto him, Master, all these have I observed from my youth. 10:21 Then Jesus beholding him loved him, and said unto him, One thing thou lackest: go thy way, sell whatsoever thou hast, and give to the poor, and thou shalt have treasure in heaven: and come, take up the cross, and follow me.