please do not compare people believing in a religion based on some junkie kids acid trip by choice to people being a colour skin at birth, that is disgusting.

Are they losing faith altogether, or are they merely abandoning their traditional religion and putting their faith in other things? I think it's the latter. Organized atheists are some of the most religious people I've ever met, and for most of the people who shout the loudest about the need for separation between church and state, their church is the state.

But in that case you would make new assumptions. One being that this god actually care about its creations and is willing to interfere with how they live their lives, another being that making everyone lose their faith at one point wasn't part of this deity's plan all along; to test the potential faith of newer generations who are surrounded (or maybe distracted?) by high technology and more developed science based education. Another theory would be that the deity may have realized that the time has arrived where religious faith actually causes more harm than good, making the people more healthy by being non-religious. (<--- Or at least that's how a truly sympathetic and almighty deity should resonate, in my opinion.)

Still, the thread is supposed to assume that there is no god, given how the existence of gods is not backed up by science. But yeah, it's fun and interesting to play with the thought.

I understand that, but I don't really see the connection.

We are all familiar with how religion has been passed on for generations, spanning over thousands of years: That

Try spanning the last 420,000 years... That's the truth.

Religious parents inform their children about their faith (which is provably not backed up by science or logic, in most cases)

It's usually backed up by logic. And there's some very convincing scientific theories connected to religions. Did you know quantum physics theory comes from an ancient school of Hinduist philosophy?

and sometimes (if not mostly, globally speaking) even forces them to follow their lead. They are told that their belief is the only true belief and that all other beliefs are false. Nothing new here.

Most people are NOT told that their religion is the only true one worldwide. You'd be surprised how accepting the world is nowadays.

Now, what if we completely stopped this chain reaction for a moment?

Impossible.

We hide all writings containing religious lyrics and stories and make sure that no religious views are passed down to newer generations.

Impossible.

All schools in the entire world teaches nothing but scientific facts and theories, while all forms of belief based knowledge is completely disregarded.

They would have to disreguard a lot of belief based science that we use... It would ruin science to get rid of belief based theories.

At this point there may be some people who make up their own religion, but for many reasons all fail to gain significant ground. (I mean, even if someone tried to spread some kind of new religion nowadays people would most likely call him crazy, or at least not start believing in whatever he is believing).

I started multiple religions. I have many follewers. Many girls and boys have thought I was Jesus, Buddha, the antichrist, you name it. It is very easy to start and propagate a religion. Especially if you know basic social enginering and hypnosis teqniques. 

And then it happens: All the old religions are suddenly reintroduced to the world population. Schools throughout the world still won't teach any religion as fact, but their existence and details are acknowledged, and spread through the education system.

 Sounds good.

So, the question is this: Do you think any religion would be able to regain its lost ground after this complete blackout, and if so, which?

All of them 

please do not compare people believing in a religion based on some junkie kids acid trip by choice to people being a colour skin at birth, that is disgusting.

I suggest you think about this: Most people born in the middle east end up being Muslim. Is it random that almost all people born in the middle east end up being Muslim while most people born in western societies tend to be Christian (compared to other religions)?

People fall prey to their environment. You can't possibly know that you would have ended up being non-religious if you were born in India instead of wherever you were born. In fact, it's rather foolish to assume that you wouldn't follow the same faith as the people around you. Especially in countries were religion plays a way greater role than in western countries.