The garish yellow flyers which read "democracy is a system whereby man violates the right of Allah" were stuck on lamp-posts and bus stops this week in Grangetown - a predominantly Muslim area of the Welsh capital.
Ahead of next month's general election, the posters also say: "Islam is the only real workable solution for the UK," before carrying the hashtag #Dontboteformanmadelaw.
Cardiff Council workers have begun removing the "chilling" and "threatening" posters.
Parent Greg Pycroft, 36, was with his two-year-old son when he came across 20 posters plastered on his walk to nursery.
The Welsh Government worker said: "It was quite chilling and threatening to see these posters."
Local councillor Ashley Govier said: "People have a right to vote and that needs to be respected. Grangetown is a very tolerant area but it's got to go both ways.
"If they do choose not to exercise their right to vote, that's their business but we're trying to encourage people to do so and this is unhelpful and not very nice."
Cardiff Council said religiously motivated posters "that can cause offence" will be removed as a priority.
Sahar al-Faifi, from the Muslim Council of Wales, said the posters are in response to the voter registration campaign in Cardiff for the last three months.
The 29-year-old added: “The hateful people behind these posters do not represent us.
"The reason behind these posters is we have had such a successful voter registration campaign across mosques in Cardiff.
"We have been doing it every Friday for three months to encourage worshippers in an unpartisan way to participate in their civic duties.
"Most mosques were on board.
"The mosques believe they can be part of the political process of this country."
http://www.express.co.uk/news/uk/571358/Muslims-abstain-voting-General-Election-Allah-Cardiff
