I had never read the wiki before. That criticism and your reaction are interesting. I strive to acknowledge when my ideas germinate from others. Not because it's otherwise plagiarism but because I like to give credit where credit is due, and I get angry when I see gurus like Tolle making money off of the ideas of others without at least acknowledging that there's nothing new or unique about what they write or sell tickets to hear.
What I find interesting in the wiki is that apparently Walsch said he was not actually channeling "God" even though that's the impression the book gives. Regardless of what he says, I will continue to often refer to his quotes as channeled.