I haven't read the whole thread but I have to comment this.
I think that God invented our world in a very clever way - those conformists have no children or not too many, so they will die.
Followers have children, so they will not die

- simple like an evolution - the better will survive.
There's also the quality over quantity approach to the child raising.
You're just assuming that having strategy of larger birth rate is better compared to strategy of getting only couple of children that are more likely to be more succesful and follow in the footsteps of their parents.
And when we are talking about meme of religion that has lost quite of lot power recently, the whole idea of higher birth rate being deciding factor is badly flawed.
There are other factors to be considered. Such as education, secularism of the governments and the effect of science and also popular culture into cultural evolution etc.
In some places of Europe whether you are religious or not, doesn't hardly even matter unless you're nutjob about it. The religion has become just a bad habit (no offence that's the way it just is) or traditional ritual followed because of felt responsiblity to do so without real piety, zeal or decide it to take any further than that.
Eran of Arcadia said:
And if human history has told us anything, belief in God is the default state.
Yes, conforming into the society's pressure to belief it is the default state has been the way.
Now that people are more free to choose, the default state IMO be that there's no need to believe into God.
Especially considering christianity that seems to put lot of effort towards convincing it's about "free will" isn't it what it's about?
Religious people should have more effort to put forward message and show that it's positive to choose God and their religion rather than message of negativity and disdain of not choosing them.
Moral pressure just makes people nowadays take steps away from the church not towards it since it has no real meaning to the people it used to have.
Holycannoli said:
People, young people especially, just don't want to be bothered with it's morals and limitations on life, so they instead subscribe to the idea that it's all false (makes their lives easier you know? That's what I used to do before my own personal resurgence).
Actually it's quite the opposite.
People who choose not to be religious sees the limitations of life (one life without the possibility of after life) more clearly than religious people. Morals come naturally to people after this understanding. If you lose this chance, you lose everything, so choose wisely.
So it's time to ask yourself, what do you believe in?
If you felt your own life being empty, short and without morals without religion, don't think rest of the people think so.
Holycannoli said:
I do predict though that with the massive Islamic immigration going on in Europe, if it gets out of hand there will be a minor resurgence to sort of counteract the Islamic influence. Europe has traditionally been Christian and I don't think a heavy Islamic influence will be much appreciated.
You think non-religious people like Islam more than Christianity?
Probably there would be also countermovement against religion in general in such case.