Who gets to define what a 'radical lslamist' is? A politician in the UK once said that a radical Muslim is anyone who prays five times a day. In that case, basically all Muslims are radical Islamists. Are Muslim women 'radical Islamists' for choosing to wear hijab?
France's interior minister recently said: "French Islam must be certain that all its followers consider the 'law of the Republic' to be superior to those of their God..." Muslims must obey the law of the land they inhabit, but are French Muslims going to be commanded to worship the Republic now? Were Darmanin (the interior minster) to define 'radical Islamist', as he has done, it would probably anyone that studies and practices their religion openly and faithfully, and anyone who disagrees with certain progressive laws of the French Republic such as same-sex marriage. This is most of the Muslims.
If ministers like Darmanin get to define what a radical Islamist is, they can reshape its scope to their liking to prosecute any dissenting Muslim, especially according to Macron's anti-separatism bill, that they deem a threat to the 'holy French Republic'. And perhaps that person isn't even a Muslim. Perhaps they're just an immigrant, or an ordinary person who disagrees with the government's policies.
Perhaps Macron will become like Kemal Atatürk, recreating Islam in the Republic's image just as Atatürk did in Turkey in the '20s and '30s, ordering that the call to prayer be recited in French, that the teaching of the Quran and the Arabic language be suppressed, that ordinary Muslim women don't get to cover up in public anymore, all under the petty guise of 'bettering' Islam. Tarring all French Muslims with the same brush, and attempting to strip Muslims of their faith can only create more problems than it will solve.