The funny thing about fundamentalism, is that when fundamentalists sometimes snap out of it, they go on thinking that religion is mostly fundamentalist, just like they were. So they learn to disbelieve in what they believed before, without realizing that the nature of religious experience could be quite different than the way they once understood it. The literalist, narrow, fundamentalist understanding of religion persists. It very rarely evolves.
The funny thing about this is that it often results in bitterness. The believer-turned-non-believer becomes bitter. Now that they've "seen the light" they must now lash out at their former religion and those that still practice it. They have to have a negative view towards it. This is natural, but it is also negative. When we dump something we tend to dislike it, this is how we move on.
Funny enough, the bible actually has a lot to say about bitterness.
Prov. 14:10
Jer. 2:19
James 3:14
Job. 9:17-18
Job. 21:25
Job 7:11, 10:1
Heb 12:15
The bible is interesting that way. It's full of clues as to how to understand our inner nature. But the bitter, former-fundamentalist already has the answers. They completely overlooked these passages when assessing the "truth" in scripture. Instead, they'll take the misunderstood "sword" passage out of context, and in English, and say, "see?" ... as if an anecdote, or a couple of anecdotes would disprove anything else, anyway.
It's all very unfortunate.