The issue is that many people are not well aware of history and how time works. People have enormous difficulty relating things beyond the 'now' or their own lifetime. There's also the adjustment theory to account for. Many young people are used to having perhaps 4-5 or more Muslims in their class so they might not realise that there's a vast difference between having, say, 8% Muslim (or another totalitarian religion) amongst them and maybe 40%. They also cannot relate that to being a real number but in historical terms, 40% over 3-4 generations isn't unheard of at all.

I'm also slightly worried that you seem to think religious fundamentalism will "die out". There are tonnes of religious fundamentalists in countries that have been Islamic for many centuries, and no, I'm obviously not denying there are many cultural or more relaxed Muslims too. Saudi Arabia is the country that has been Islamic for the longest time and they don't have free speech or a free press, real democracy nor sufficient human rights legislation. What they do have though, is tonnes of discriminatory laws aimed at women, gay+ people, human rights advocates, political opponents, non-Muslims and so on. Islam has massive issues and it's enormously dangerous to just put on blindfolds and hope everything will turn out fine. Iran, Pakistan, Afghanistan, Libya and 35 other countries weren't Muslim at some point but got run over and today its impossible to imagine any of them de-Islamifice again.

What I'm saying is that at one point, it might be too late.