The court found Darski guilty of insulting religious feelings and fined him 15,000 zlotys (3,336 euros).
The well-known musician must also pay court costs in the amount of 3,500 zlotys (779 euros).
Polish laws on insulting religious feelings have been criticized in the context of this and other issues, with opponents complaining that the laws are too restrictive of freedom of expression.
The musician promised to appeal the sentence, reports the news agency PAP, referring to his lawyer.
Darskis published the photo on the social network “Facebook” in 2019.
The investigation was launched in response to complaints from the ultra-conservative organization Ordo Iuris and the Patriot Society.
Darski has attracted attention with scandals before. That’s when he tore the Bible at one of the band’s concerts.
The extreme metal band formed in 1991 is known for the use of pagan and satanic images. One of its best known albums is “The Satanist”.
Poland is a highly Catholic state, and the ruling national conservative party, Law and Justice, is pursuing a political course that is largely in line with Catholic teachings.