I clicked on your source and looked at the recommended books. Just as I suspected, it is mostly Emergent Church authors. Not good. They love doubt.
The Spurgeon Archive. The following excerpt is from "The Three Witnesses," a sermon originally preached at the Metropolitan Tabernacle on Sunday morning, 9 August 1874.
I feel sick to death of the common talk about the healthiness of doubting and the beauty of "modern thought." This talk is only the self-praise of a set of concealed infidels treacherously lurking in God’s church.