It is Biblical… He sends Strong Delusion to unbelievers!
2 Thessalonians 2:10-12 KJV
[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. [11] And for this cause God shall send them strong delusion, that they should believe a lie: [12] That they all might be damned who believed not the truth, but had pleasure in unrighteousness.