Originally Posted by philologos
Pew Forum 2009 - http://www.pewforum.org/Faith-in-Flux.aspx
Most Christians that I have met, have had a stage in their lives when they have started to make sense of their own beliefs for themselves, irrespective of what mum and dad might think. For me, I wasn't too sure of it all. I decided to read the Bible cover to cover as a teenager and I started to see that it was true concerning the human condition and our relationship with God. It opened my eyes in fact, as there was whole swathes of content in there that I had never heard before in my life. It made me rethink what perception I had of what this life thing was about.
The idea of children having brains that superglue ideas about God to their brains is simply demonstrably false. Even the UK chart shows that. Ultimately, people must realise what makes sense for themselves whether they like it or not, or whether their parents like it or not. That's simply life.
Again, there are millions of people becoming Christians in the world who aren't from a Christian background. Indeed, most growth is happening in areas of the world where Christianity hasn't been heard of. Christianity in the 21st century is fundamentally different to any other century in so far as nobody can no longer say that it is mostly confined to traditionally Christian countries. There are more Christians outside of the Western world than are inside it.
I would expect most Christian conversions today to be in non Christian countries due to simple saturation of the market in the west. The US and UK data shows this well as here people mostly change within
Christianity and very little to
People will of course make their own determination as to what religion they want to follow. I would think the options they consider seriously though are mainly driven by what they are exposed to. Access to information about other religions may be freely available but accessing praticing members is much less so, as such there is far less exposure to the very different/minority religions. Obiously people will be mostly exposed to the religion of their parents and their community. I would guess that raising a child to believe that the doctrines of a religion are true would more likely produce a child that would not want to go against those doctrines. If it didn't then the religious wouldn't even bother with children would they. It isn't super glue, but it does stick sometimes, and from the data is seems to stick more often than not(and when not it doesn't stray too far from the Christianity nest).
As to the OPs question I would doubt if a Christian in the UK was instead brought up a muslim they would still find the Christian message convincing and convert, simply from the rarity of this happening in real life. Maybe a Catholic converting to CofE or similar seems more cerdible.