This was before a whole series of terror attacks in Europe and elsewhere in 2015 and on, but still wild.
https://www.newsweek.com/16-french-citizens-support-isis-poll-finds-266795
One in six French citizens sympathises with the Islamist militant group ISIS, also known as Islamic State, a poll released this week found.
The poll of European attitudes towards the group, carried out by ICM for Russian news agency Rossiya Segodnya, revealed that 16% of French citizens have a positive opinion of ISIS. This percentage increases among younger respondents, spiking at 27% for those aged 18-24.
A recent Ifop poll placed French president Francois Hollande's approval rating at just 18%.
The survey also tested attitudes in Britain and Germany and found that 7% of British citizens responded favourably to ISIS. However, UK polling showed an inverse demographic trend to that of France, with support for ISIS rising with age. 4% of 18-24-year-olds saying they either strongly or somewhat support ISIS, compared to 6% of 24-35-year-olds surveyed and 11% of 35-44-year-olds. Positive attitudes to ISIS in Germany showed less divergence, remaining between 3% and 4% for all age groups.
2014 but feels like ancient history
...but France is 5% Muslim (8% among under 30s)
And even then I highly doubt that even in most chud (but still not outright lies) estimates, more than a quarter of them would support such groups