The shipoffools.com website has been receiving entries over the last few weeks and has now created a shortlist of eight contenders (www.shipoffools.com/features/2014/badvent_vote.html).
Included are entries from adult shop Ann Summers and whiskey manufacturer Drinks by the Dram.
The website wants the public to vote on which calendar is the furthest from the original Christmas story.
Editor Simon Jenkins said: "The historical fusion of a midwinter festival and the incarnation, to create Christmas, was always going to throw up conflicting messages.
"However, a recent spate of bizarre calendars has meant many have lost the original meaning of Advent and prompted us to find the least inspiring on the market."
Ten million of the chocolate gifts are expected to be sold in the run-up to Christmas.
Ship of Fools co-editor Steve Goddard said: "'We're not calling on shops to get rid of these products but to give shoppers alternatives which tell the Bethlehem story.
"We've also discovered that only two calendars are fairly traded and just one, The Real Advent Calendar, has a charity focus. This is disappointing given that the original message of Christmas is aspirational: peace on earth, goodwill to all people, the hopeful search of the Magi, the selfless giving of God's gift."
The Real Advent Calendar launched in recent years to combat the secular trend.
Telling the Christmas story, it is now stocked in many supermarkets.
Listen to Steve Goddard speaking on Premier's News Hour earlier this month: