i would like to like at the other side why did only we (otd, undercovered) came to this conclusion that its not true are we more educated or smarter then everyone who stays jewish?
In other words why were we not smart enough to defend Judaism to ourselves? Why can James Kugel believe in the DH buy still remain Orthodox while we can't? Are we smarter than him? Do we know something he doesn't know?
I can't speak for other people but I can speak for myself. It is my belief that the reason this stuff got to me was not because of the content of it but rather because of the way I found out.
In other words a bunch of coincidental factors contributed to it:
1. No one ever told me that there was a DH. I'd heard of this vague thing called Bible Criticism but I didn't realize how developed it was. Similarly I found out that Karaites exist nowadays and reject the Talmud! Something else I had not been aware of. I began realizing that a lot of very normal people simply rejected things I had always taken for granted.
In contrast, learning about evolution never phased me because I'd grown up with the proper defenses. I had been openly taught about evolution and it had been explained to me that God guided evolution, that 6 days of creation were not literal etc. In other words I'd incorporated the problem into my personal theology and didn't think of it as a problem because, in my mind, תשובתו בצדו - the answer was always there. I could only think of the problem of evolution and the answer to that problem as one thing, and to me the problem never stood by itself.
If I'd been raised fully knowing what the DH said but at the same time been raised with the solution, even a lame solution, I doubt that it would have gotten to me at all.
2. I was very scared of the consequences of learning these things and therefore instead of facing them head on I tried to ignore them (like good Jews should!) and let them simmer for about 6 years in my head until they effectively eroded my faith. Had I been mature enough at the time to face these problems I might have built up some sort of intellectual defense before my faith was gone.
3. Once your faith is gone its gone. And therefore when I was older and learned new and ingenious defenses of Judaism it did not matter because the faith was gone. I could intellectually defend Judaism but I could not rebuild a childhood feeling which had slowly disappeared.
This is my own theory about myself and I wrote about this a bit on the interview on Coin Laundry's blog:
So if I had to sum it up I'd say a series of coincidences led me down the path I did, and if a few things had been different I might be learning in Kollel in Bnei Brak today.