Larry Alex Taunton posts some helpful observations about the factors which play into young people’s conversions to atheism. Perhaps the most important one comes at the end:

The internet factored heavily into their conversion to atheism

When our participants were asked to cite key influences in their conversion to atheism – people, books, seminars, etc. – we expected to hear frequent references to the names of the “New Atheists.” We did not. Not once. Instead, we heard vague references to videos they had watched on YouTube or website forums.

This is just as true, if not more so, for those various moves within Christianity, and it is the primary reason that this website exists.