The statistic means that 20 years from now, France will be 25% muslim, with commensurate representation in public office. In 40 years, France will be majority muslim. By the end of the century, it will be 95% muslim. Once the muslims reach a majority, they will seize power through the electoral process, institute national sharia law, and start exterminating the non-muslims.
This is going to happen in
Sweden
Denmark
Holland
Belgium
Germany
Italy, and yes
Britain
I think it will not happen in Poland, Hungary or Romania. But those countries better be prepared for war against what was once their EU compatriots.
And so should we.