Romans 1:21

for when they knew God, they did not glorify him as God. They did not thank him and were vain in their reasoning, for their foolish hearts were darkened.

Jeremiah 2:5

Jehovah says: What bad thing (injustice) did your fathers find in me that they went so far away from me? They followed worthless idols and became worthless (lead astray) themselves.

Ephesians 4:17-18

This I say therefore, and testify (affirm) in the Lord, that you no longer walk as the nations also walk, in the vanity (futility) (depravity) of their mind (thinking).

2 Kings 17:15

They refused to obey his instructions. They did not keep the covenant he made with their ancestors. They disregarded his warnings. They worshiped worthless idols and became worthless themselves. They followed the customs of the surrounding nations, disobeying Jehovah's command not to imitate them.

Romans 1:19

That which is known about God is clear to them, for God revealed it to them.

Revelation 14:7

He spoke in a loud voice: Respect God, and give him glory! The hour of his judgment has come. Worship him who made heaven, and earth, and the sea, and the fountains of waters.

Genesis 6:5

Jehovah saw how great man's wickedness on the earth had become. Every inclination of the thoughts of his heart was only evil all the time.

Genesis 8:21

Jehovah smelled the pleasing aroma and said in his heart: Never again will I curse the ground because of man, for the intent of his heart is evil from childhood. I will never again destroy every living creature, as I have done.

Deuteronomy 28:29

that even in bright sunshine you will have to feel your way around like a blind person. You will tell day from night! For the rest of your life, people will beat and rob you. No one will be able to stop them.

Psalm 50:23

Whoever offers thanks as a sacrifice honors me. I will let everyone who continues in my way see the salvation that comes from God.

Psalm 81:12

Therefore I gave them over to their stubborn hearts. They walked in their own counsel.

Psalm 86:9

All the nations that you have made will bow in your presence, Jehovah. They will honor (glorify) you.

Ecclesiastes 7:29

You see! I have found only this, that God made man upright. But they have sought out many devices (schemes) (reasonings).

Isaiah 44:9-20

All who make idols are nothing. The things they treasure are worthless. Those who would speak up for them are blind. They are shamefully ignorant.

Isaiah 60:2

Darkness now covers the earth! Thick darkness overwhelms the nations. But Jehovah shines for you. His glory appears to you.

Jeremiah 10:3-8

The people's customs are erroneous and empty. It is wood cut from the forest. It is the work of the hands of a craftsman with a cutting tool.

Jeremiah 10:14-15

Every man is stupid lacking knowledge. Every goldsmith is put to shame by his idols. His molten images are deceitful. There is no breath in them.

Jeremiah 16:19

Jehovah is my strength and my fortress, my refuge in times of trouble. Nations come to you from the most distant parts of the world and say: Our ancestors have inherited lies, worthless and unprofitable gods.

Hosea 2:8

She did not know that I gave her the grain, the new wine and oil, and multiplied her silver and gold, which they used for Baal.

Habakkuk 1:15-16

He brings them all up with the hook. He gathers them away in his net. He gladly gathers them and rejoices.

Luke 17:15-18

When he was healed, one of them came back and praised God in a loud voice.

John 3:19

This is the judgment, that the light has come into the world. People loved the darkness rather than the light for their works were evil.

Romans 1:28

They did not like to retain God in their knowledge, so God gave them over to a reprobate (depraved) mind, to do things that are not fitting.

Romans 11:10

Let their eyes be darkened, that they may not see, and bow down their back always. (Psalm 69:23)

Romans 15:9

That the nations might glorify God for his mercy as it is written: For this cause I will confess you to the people of the nations, and sing to your name.

2 Timothy 3:2

For men will be lovers of their own selves, covetous (lovers of money), arrogant, proud, blasphemers, disobedient to parents, unthankful (ungrateful), unholy,

1 Peter 1:18

Know that you were redeemed from your futile way of life inherited from your fathers. [The redemption] was not with corruptible things like silver or gold,

1 Peter 2:9

You are a chosen race, a royal priesthood, a holy nation, and a people for God's own possession, that you may show the excellence of him who called you out of darkness into his marvelous light.

Revelation 15:4

Who will not reverence you, Jehovah, and glorify your name, for only you are holy. All nations will come and worship you. Your righteous judgments are clearly apparent.

Acts 26:18

To open their eyes, and to turn them from darkness to light, and from the power of Satan to God. They may receive forgiveness of sins, and inheritance among those who are sanctified by faith in me.'

Treasury of Scripture Knowledge

Summary

Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.

Bible References

When

Romans 1:19
That which is known about God is clear to them, for God revealed it to them.
John 3:19
This is the judgment, that the light has come into the world. People loved the darkness rather than the light for their works were evil.

They glorified

Romans 15:9
That the nations might glorify God for his mercy as it is written: For this cause I will confess you to the people of the nations, and sing to your name.
Psalm 50:23
Whoever offers thanks as a sacrifice honors me. I will let everyone who continues in my way see the salvation that comes from God.
Psalm 86:9
All the nations that you have made will bow in your presence, Jehovah. They will honor (glorify) you.
Hosea 2:8
She did not know that I gave her the grain, the new wine and oil, and multiplied her silver and gold, which they used for Baal.
Habakkuk 1:15
He brings them all up with the hook. He gathers them away in his net. He gladly gathers them and rejoices.
Luke 17:15
When he was healed, one of them came back and praised God in a loud voice.
2 Timothy 3:2
For men will be lovers of their own selves, covetous (lovers of money), arrogant, proud, blasphemers, disobedient to parents, unthankful (ungrateful), unholy,
Revelation 14:7
He spoke in a loud voice: Respect God, and give him glory! The hour of his judgment has come. Worship him who made heaven, and earth, and the sea, and the fountains of waters.
Revelation 15:4
Who will not reverence you, Jehovah, and glorify your name, for only you are holy. All nations will come and worship you. Your righteous judgments are clearly apparent.

But became

Genesis 6:5
Jehovah saw how great man's wickedness on the earth had become. Every inclination of the thoughts of his heart was only evil all the time.
Genesis 8:21
Jehovah smelled the pleasing aroma and said in his heart: Never again will I curse the ground because of man, for the intent of his heart is evil from childhood. I will never again destroy every living creature, as I have done.
2 Kings 17:15
They refused to obey his instructions. They did not keep the covenant he made with their ancestors. They disregarded his warnings. They worshiped worthless idols and became worthless themselves. They followed the customs of the surrounding nations, disobeying Jehovah's command not to imitate them.
Psalm 81:12
Therefore I gave them over to their stubborn hearts. They walked in their own counsel.
Ecclesiastes 7:29
You see! I have found only this, that God made man upright. But they have sought out many devices (schemes) (reasonings).
Isaiah 44:9
All who make idols are nothing. The things they treasure are worthless. Those who would speak up for them are blind. They are shamefully ignorant.
Jeremiah 2:5
Jehovah says: What bad thing (injustice) did your fathers find in me that they went so far away from me? They followed worthless idols and became worthless (lead astray) themselves.
Jeremiah 10:3
The people's customs are erroneous and empty. It is wood cut from the forest. It is the work of the hands of a craftsman with a cutting tool.
Jeremiah 16:19
Jehovah is my strength and my fortress, my refuge in times of trouble. Nations come to you from the most distant parts of the world and say: Our ancestors have inherited lies, worthless and unprofitable gods.
Ephesians 4:17
This I say therefore, and testify (affirm) in the Lord, that you no longer walk as the nations also walk, in the vanity (futility) (depravity) of their mind (thinking).
1 Peter 1:18
Know that you were redeemed from your futile way of life inherited from your fathers. [The redemption] was not with corruptible things like silver or gold,

Their foolish

Romans 11:10
Let their eyes be darkened, that they may not see, and bow down their back always. (Psalm 69:23)
Deuteronomy 28:29
that even in bright sunshine you will have to feel your way around like a blind person. You will tell day from night! For the rest of your life, people will beat and rob you. No one will be able to stop them.
Isaiah 60:2
Darkness now covers the earth! Thick darkness overwhelms the nations. But Jehovah shines for you. His glory appears to you.
Acts 26:18
To open their eyes, and to turn them from darkness to light, and from the power of Satan to God. They may receive forgiveness of sins, and inheritance among those who are sanctified by faith in me.'
1 Peter 2:9
You are a chosen race, a royal priesthood, a holy nation, and a people for God's own possession, that you may show the excellence of him who called you out of darkness into his marvelous light.

General references

Psalm 94:11
Jehovah knows the thoughts of man. He knows that they a mere vanity.
Isaiah 40:21
Have you not known? Have you not heard? Has it not been told to you from the beginning? Have you not understood since the earth was founded?
Jeremiah 33:18
and that there will always be priests from the tribe of Levi to serve me and to offer burnt offerings, grain offerings, and sacrifices.'
James 4:17
He that knows to do good, and does not do it, to him it is sin.