Fantasy / Parody: Set in modern times, main character, man, anti-hero cliche, has to prevent the biblical apocalypse or stop the antichrist or similar plot. Read 2000-2010. Spoiler.

[Sirence]

Book was either English or German. Crude humor and adult themes. Female companion love interest. Low quality writing and content. Read somewhere between 2000 and 2010.

Major antagonist was a talking basilisk.

Spoiler: in the end the man and his love interest adopt the basilisk who was reborn as a child