A group of radical Muslims is planning to use St Paul's Cathedral to protest against the sins of British society and the fallacy of the Bible.
The protesters were due to gather putside the cathedral at 1pm, while a Christmas Eve Eucharist takes place inside.
Ahead of the protest, radical preacher Anjem Choudary claimed that Jesus belonged to Islam and that British society was riddled with "sin".
"We say Jesus is a Muslim prophet and not the Son of God," he said in a leaflet.
Choudary, a former solicitor, has previously been linked to raidical groups including Al Gruabba and Islam4Uk, which were banned by the government for inflammatory preaching and praising terroist attacks including 9/11 and the 7/7 London bombings.
Although Choudary and his fellow organisers claimed their meeting was simply a "Christmas Debate", they said they would attack a litany of supposed societal faults including "bribery, pornography, homosexuality, blasphemy and promiscuity".
Organisers said: "The UK claims to be a Christian country yet is plagued by all that Jesus stood against. So who is Jesus? We as Muslims hold on to the values of our Muslim brother Jesus without compromise."
Nobody at St Paul's Cathedral could be reached for comment by IBTimes UK. However, a City of London Police spokesman said: "We are aware of it and are not expecting a significant event."