Elsewhere Paul has said:
Therefore, you are without excuse, every one of you who passes judgment. For by the standard by which you judge another you condemn yourself, since you, the judge, do the very same things. We know that the judgment of God on those who do such things is true. Do you suppose, then, you who judge those who engage in such things and yet do them yourself, that you will escape the judgment of God? Or do you hold his priceless kindness, forbearance, and patience in low esteem, unaware that the kindness of God would lead you to repentance? By your stubbornness and impenitent heart, you are storing up wrath for yourself for the day of wrath and revelation of the just judgment of God, WHO WILL REPAY EVERYONE ACCORDING TO HIS WORKS: eternal life to those who seek glory, honor, and immortality through perseverance in good works, but wrath and fury to those who selfishly disobey the truth and obey wickedness. Yes, affliction and distress will come upon every human being who does evil, Jew first and then Greek. But there will be glory, honor, and peace for everyone who does good, Jew first and then Greek. There is no partiality with God. (Romans 2:1-5)But let us turn to the words of John 6 which you quoted. Yes, we must believe, but what does it mean to believe? It is not just have faith in the saving work of Jesus on the Cross, but also to believe in all that he has taught us. Thus:
Not everyone who says to me, ‘Lord, Lord,’ will enter the kingdom of heaven, but only the one who does the will of my Father in heaven. Many will say to me on that day, ‘Lord, Lord, did we not prophesy in your name? Did we not drive out demons in your name? Did we not do mighty deeds in your name?’ Then I will declare to them solemnly, ‘I never knew you. Depart from me, you evildoers. (Matthew 7:21-23)And again:
Now someone approached him and said, “Teacher, what good must I do to gain eternal life?” He answered him, “Why do you ask me about the good? There is only One who is good. If you wish to enter into life, keep the commandments.” He asked him, “Which ones?” And Jesus replied, “ ‘You shall not kill; you shall not commit adultery; you shall not steal; you shall not bear false witness; honor your father and your mother’; and ‘you shall love your neighbor as yourself.’” (Matthew 19:16-19)And how many parable are there of our Lord that warn us that we will be judged by our actions? While Protestants claim to base their believes "on Scripture alone," in reality they just ignore those parts of the Bible that contradict their belief in "by faith alone." Their claim of being "Bible believing" Christians is a sham.
It's either that or the CLEAR WORDS of an angel of GOD: