The existence of God has been made evident to all. People fall under condemnation when they choose to suppress this knowledge in order to commit evil.
Joh 1:9 That was the true Light, which lighteth every man that cometh into the world.
Rom 1:20 For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse:
Joh 3:19 And this is the condemnation, that light is come into the world, and men loved darkness rather than light, because their deeds were evil.
When someone sells themselves into committing sin the heart becomes hardened due to the deceitfulness of sin which dims the light of God.
Heb_3:13 But exhort one another daily, while it is called To day; lest any of you be hardened through the deceitfulness of sin.
The Scripture warns that those who choose to do this risk being given up to a reprobate mind and strong delusion.
Rom 1:28 And even as they did not like to retain God in their knowledge, God gave them over to a reprobate mind, to do those things which are not convenient;
2Th 2:10 And with all deceivableness of unrighteousness in them that perish; because they received not the love of the truth, that they might be saved.
2Th 2:11 And for this cause God shall send them strong delusion, that they should believe a lie:
2Th 2:12 That they all might be damned who believed not the truth, but had pleasure in unrighteousness.