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Adam was not made to be mortal (Genesis 2.) He was banished to mortality in Genesis 3. (emphasis mine)

And it came to pass, when men began to multiply on the face of the earth, and daughters were born unto them, That the sons of God saw the daughters of men that they [were] fair; and they took them wives of all which they chose.

And the LORD said, My spirit shall not always strive with man, for that he also [is] flesh: yet his days shall be an hundred and twenty years.

There were giants in the earth in those days; and also after that, when the sons of God came in unto the daughters of men, and they bare [children] to them, the same [became] mighty men which [were] of old, men of renown.

And GOD saw that the wickedness of man [was] great in the earth, and [that] every imagination of the thoughts of his heart [was] only evil continually.

And it repented the LORD that he had made man on the earth, and it grieved him at his heart. And the LORD said, I will destroy man whom I have created from the face of the earth; both man, and beast, and the creeping thing, and the fowls of the air; for it repenteth me that I have made them.

But Noah found grace in the eyes of the LORD. These [are] the generations of Noah: Noah was a just man [and] perfect in his generations, [and] Noah walked with God. And Noah begat three sons, Shem, Ham, and Japheth.

The earth also was corrupt before God, and the earth was filled with violence. And God looked upon the earth, and, behold, it was corrupt; for all flesh had corrupted his way upon the earth. – Genesis 6:1-12

People of Noah’s day did not consider themselves corrupt – nor do they now consider themselves corrupt – nor will they when Jesus returns.

But as the days of Noe [were], so shall also the coming of the Son of man be. For as in the days that were before the flood they were eating and drinking, marrying and giving in marriage, until the day that Noe entered into the ark, And knew not until the flood came, and took them all away; so shall also the coming of the Son of man be. – Matthew 24:37-39

Corruption cannot inherit incorruption. We must be born again (John 3):

So also [is] the resurrection of the dead. It is sown in corruption; it is raised in incorruption: It is sown in dishonour; it is raised in glory: it is sown in weakness; it is raised in power: It is sown a natural body; it is raised a spiritual body. There is a natural body, and there is a spiritual body. And so it is written, The first man Adam was made a living soul; the last Adam [was made] a quickening spirit.

Howbeit that [was] not first which is spiritual, but that which is natural; and afterward that which is spiritual. The first man [is] of the earth, earthy: the second man [is] the Lord from heaven. As [is] the earthy, such [are] they also that are earthy: and as [is] the heavenly, such [are] they also that are heavenly. And as we have borne the image of the earthy, we shall also bear the image of the heavenly.

Now this I say, brethren, that flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption. – I Cor 15:42-50

Jesus Christ is the only way for us to go home.

There is no error in Genesis 6. But all attempts to rationalize God lead to error:

For my thoughts [are] not your thoughts, neither [are] your ways my ways, saith the LORD. – Isaiah 55:8

Maranatha, Jesus!