My experience is that people who have changed belief systems tend to be far more aggressive about it than those who haven't. When I spent time on atheist newsgroups, the ones who had grown up fundamentalist christian were by far the most radical. Looking the other way, you don't have to look farther than C.S. Lewis to see what a Christian who used to be an atheist acts like.

People with a memory of IWETHEY history can just remember Ben Kosse and Nick Petreley to see examples each way of this, with each having made the opposite transition in beliefs.

Therefore the revelation that key members of the ID movement were once atheists doesn't surprise me. I'd have expected that. Doubly so since acceptance of a personally acceptable compromise between existing scientific evidence and their developing religious faith could well have been a key part of converting for them.

Cheers,
Ben