"On paper, France would seem one of the least likely places for this branch of Christianity to gain a foothold. For centuries, Protestantism was the embattled minority in a country Catholics liked to call the ''eldest daughter of the church'' because of its strong ties to Rome. That minority still makes up just 3 per cent of the population.....From a postwar population of about 50,000, French evangelicals are now estimated to number 450,000 to 500,000. According to the Evangelical Federation of France, the number of churches has risen from 800 in 1970 to more than 2200 today."
Here's the link to the cited article. If religion was so backward and an impediment for people, you would think that it would be dying out rather than greatly expanding in such an atheistic environment. Atheism is devoid of answers whereas Christianity provides hope and comfort for individuals.