This book was painful to read. It was like sitting through a lecture where you constantly wanted to raise you hand and say, "But professor...." The author meant well, but his biblical exegesis and reasoning were deeply flawed. He would state that the Bible commands separation from unbelievers and apostates (which it does), but would then subjectively define what constitutes apostasy. He doesn't explicitly state it, but his reasoning implies that those who do not hold to the same doctrines as he does is apostate and an unbeliever. So for Pickering, someone who didn't hold to a 6 day creation would be an apostate. His argumentation is also laughable. Many of his quotes used to support his separatist position are taken from Evangelicals who would not agree with his position. I wouldn't at all recommend this book. I will give it 2 stars because the first half of the book was decent. The author gave a brief history of separatist tendencies in Christian history.